diff --git a/build.gradle.kts b/build.gradle.kts
index c99257b..bf66cff 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -10,7 +10,7 @@ plugins {
 }
 
 group = "io.github.samarium150"
-version = "1.4.0"
+version = "1.5.0"
 
 repositories {
     mavenLocal()
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/MiraiConsoleDriftBottle.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/MiraiConsoleDriftBottle.kt
index 8fa2ce5..177d744 100644
--- a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/MiraiConsoleDriftBottle.kt
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/MiraiConsoleDriftBottle.kt
@@ -37,7 +37,7 @@ object MiraiConsoleDriftBottle : KotlinPlugin(
     JvmPluginDescription(
         id = "io.github.samarium150.mirai.plugin.mirai-console-drift-bottle",
         name = "Drift Bottle",
-        version = "1.4.0",
+        version = "1.5.0",
     ) {
         author("Samarium150")
         info("简单的漂流瓶插件")
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/JumpInto.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/JumpInto.kt
index 21c2cb6..3bac469 100644
--- a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/JumpInto.kt
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/JumpInto.kt
@@ -18,11 +18,16 @@ package io.github.samarium150.mirai.plugin.driftbottle.command
 
 import io.github.samarium150.mirai.plugin.driftbottle.MiraiConsoleDriftBottle
 import io.github.samarium150.mirai.plugin.driftbottle.config.CommandConfig
+import io.github.samarium150.mirai.plugin.driftbottle.config.GeneralConfig
 import io.github.samarium150.mirai.plugin.driftbottle.config.ReplyConfig
 import io.github.samarium150.mirai.plugin.driftbottle.data.Item
 import io.github.samarium150.mirai.plugin.driftbottle.data.Owner
 import io.github.samarium150.mirai.plugin.driftbottle.data.Sea
 import io.github.samarium150.mirai.plugin.driftbottle.data.Source
+import io.github.samarium150.mirai.plugin.driftbottle.util.lock
+import io.github.samarium150.mirai.plugin.driftbottle.util.randomDelay
+import io.github.samarium150.mirai.plugin.driftbottle.util.unlock
+import kotlinx.coroutines.delay
 import net.mamoe.mirai.console.command.CommandSender
 import net.mamoe.mirai.console.command.SimpleCommand
 import net.mamoe.mirai.console.command.descriptor.ExperimentalCommandDescriptors
@@ -43,9 +48,10 @@ object JumpInto : SimpleCommand(
     @Handler
     suspend fun CommandSender.handle() {
         val sender = user
-        if (sender == null)
+        if (sender == null) randomDelay().also {
             sendMessage(ReplyConfig.jumpInto.replace("%num", Sea.contents.size.toString()))
-        else {
+        } else {
+            if (!lock(sender.id)) return
             val subject = subject
             val owner = Owner(
                 sender.id,
@@ -58,7 +64,12 @@ object JumpInto : SimpleCommand(
             ) else null
             val body = Item(Item.Type.BODY, owner, source)
             Sea.contents.add(body)
-            sendMessage(ReplyConfig.jumpInto.replace("%num", Sea.contents.size.toString()))
+            randomDelay().also {
+                sendMessage(ReplyConfig.jumpInto.replace("%num", Sea.contents.size.toString())).also {
+                    delay(GeneralConfig.perUse * 1000L)
+                    unlock(sender.id)
+                }
+            }
         }
     }
 }
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/Pickup.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/Pickup.kt
index b372efa..df672c9 100644
--- a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/Pickup.kt
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/Pickup.kt
@@ -22,6 +22,11 @@ import io.github.samarium150.mirai.plugin.driftbottle.config.GeneralConfig
 import io.github.samarium150.mirai.plugin.driftbottle.config.ReplyConfig
 import io.github.samarium150.mirai.plugin.driftbottle.data.Item
 import io.github.samarium150.mirai.plugin.driftbottle.data.Sea
+import io.github.samarium150.mirai.plugin.driftbottle.util.disableAt
+import io.github.samarium150.mirai.plugin.driftbottle.util.lock
+import io.github.samarium150.mirai.plugin.driftbottle.util.randomDelay
+import io.github.samarium150.mirai.plugin.driftbottle.util.unlock
+import kotlinx.coroutines.delay
 import net.mamoe.mirai.console.command.CommandSenderOnMessage
 import net.mamoe.mirai.console.command.SimpleCommand
 import net.mamoe.mirai.console.command.descriptor.ExperimentalCommandDescriptors
@@ -41,8 +46,14 @@ object Pickup : SimpleCommand(
     @Suppress("unused")
     @Handler
     suspend fun CommandSenderOnMessage<*>.handle() {
+        val sender = fromEvent.sender
+        val subject = fromEvent.subject
+        if (!lock(sender.id)) return
         if (Sea.contents.size == 0) {
-            sendMessage(ReplyConfig.noItem)
+            randomDelay().also {
+                sendMessage(ReplyConfig.noItem)
+                unlock(sender.id)
+            }
             return
         }
         val index = Random().nextInt(Sea.contents.size)
@@ -51,6 +62,11 @@ object Pickup : SimpleCommand(
             || (item.type == Item.Type.BODY && !GeneralConfig.incrementalBody)
         )
             Sea.contents.removeAt(index)
-        sendMessage(item.toMessageChain(fromEvent.subject))
+        randomDelay().also {
+            sendMessage(disableAt(item.toMessageChain(subject), subject)).also {
+                delay(GeneralConfig.perUse * 1000L)
+                unlock(sender.id)
+            }
+        }
     }
 }
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/ThrowAway.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/ThrowAway.kt
index 4b7ecb9..056023b 100644
--- a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/ThrowAway.kt
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/command/ThrowAway.kt
@@ -24,10 +24,8 @@ import io.github.samarium150.mirai.plugin.driftbottle.data.Item
 import io.github.samarium150.mirai.plugin.driftbottle.data.Owner
 import io.github.samarium150.mirai.plugin.driftbottle.data.Sea
 import io.github.samarium150.mirai.plugin.driftbottle.data.Source
-import io.github.samarium150.mirai.plugin.driftbottle.util.CacheType
-import io.github.samarium150.mirai.plugin.driftbottle.util.ContentCensor
-import io.github.samarium150.mirai.plugin.driftbottle.util.cacheFolderByType
-import io.github.samarium150.mirai.plugin.driftbottle.util.saveFrom
+import io.github.samarium150.mirai.plugin.driftbottle.util.*
+import kotlinx.coroutines.delay
 import net.mamoe.mirai.console.command.CommandSenderOnMessage
 import net.mamoe.mirai.console.command.SimpleCommand
 import net.mamoe.mirai.console.command.descriptor.ExperimentalCommandDescriptors
@@ -44,7 +42,6 @@ object ThrowAway : SimpleCommand(
     secondaryNames = CommandConfig.throwAway,
     description = "丢出漂流瓶"
 ) {
-    private val active = mutableSetOf<Long>()
 
     @ConsoleExperimentalApi
     @ExperimentalCommandDescriptors
@@ -55,17 +52,20 @@ object ThrowAway : SimpleCommand(
     suspend fun CommandSenderOnMessage<*>.handle(vararg messages: Message = arrayOf()) {
         val sender = fromEvent.sender
         val subject = fromEvent.subject
+        if (!lock(sender.id)) return
         val chain = if (messages.isNotEmpty()) messageChainOf(*messages)
         else {
-            if (!active.add(sender.id)) return
-            sendMessage(ReplyConfig.waitForNextMessage)
+            randomDelay().also {
+                sendMessage(ReplyConfig.waitForNextMessage)
+            }
             runCatching {
                 fromEvent.nextMessage(30_000)
             }.onFailure {
                 sendMessage(ReplyConfig.timeoutMessage)
-            }.also {
-                active.remove(sender.id)
-            }.getOrNull() ?: return
+            }.getOrNull() ?: run {
+                unlock(sender.id)
+                return@handle
+            }
         }
         if (GeneralConfig.enableContentCensor) runCatching {
             if (!ContentCensor.determine(chain)) {
@@ -93,10 +93,19 @@ object ThrowAway : SimpleCommand(
         val bottle = Item(Item.Type.BOTTLE, owner, source, chainJson)
         Sea.contents.add(bottle)
         val parts = ReplyConfig.throwAway.split("%content")
-        sendMessage(buildMessageChain {
-            +PlainText(parts[0])
-            +chain
-            +PlainText(parts[1])
-        })
+        runCatching {
+            randomDelay().also {
+                if (parts.size == 1) sendMessage(parts[0])
+                else
+                    sendMessage(buildMessageChain {
+                        +PlainText(parts[0])
+                        +disableAt(chain, subject)
+                        +PlainText(parts[1])
+                    })
+            }
+        }.also {
+            delay(GeneralConfig.perUse * 1000L)
+            unlock(sender.id)
+        }
     }
 }
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/config/AdvancedConfig.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/config/AdvancedConfig.kt
new file mode 100644
index 0000000..09f499e
--- /dev/null
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/config/AdvancedConfig.kt
@@ -0,0 +1,11 @@
+package io.github.samarium150.mirai.plugin.driftbottle.config
+
+import net.mamoe.mirai.console.data.AutoSavePluginConfig
+import net.mamoe.mirai.console.data.ValueDescription
+import net.mamoe.mirai.console.data.value
+
+object AdvancedConfig : AutoSavePluginConfig("Advanced") {
+
+    @ValueDescription("At显示为纯文本")
+    val disableDirectAt by value(false)
+}
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/config/GeneralConfig.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/config/GeneralConfig.kt
index 2f233d9..9c911e9 100644
--- a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/config/GeneralConfig.kt
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/config/GeneralConfig.kt
@@ -33,4 +33,10 @@ object GeneralConfig : AutoSavePluginConfig("General") {
 
     @ValueDescription("是否缓存漂流瓶图片到本地")
     val cacheImage by value(true)
+
+    @ValueDescription("漂流瓶功能连续使用间隔 (单位: 秒)")
+    val perUse by value(10)
+
+    @ValueDescription("随机延迟回复的时间区间 (单位: 毫秒)")
+    val randomDelayInterval: Pair<Long, Long> by value(Pair(1000L, 1500L))
 }
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/data/Item.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/data/Item.kt
index 26ec4c6..69d8a0f 100644
--- a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/data/Item.kt
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/data/Item.kt
@@ -107,7 +107,7 @@ class Item {
                                     Date(timestamp)
                                         .toInstant()
                                         .atZone(ZoneId.of("Asia/Shanghai"))
-                                        .format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss O"))
+                                        .format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))
                                 )
                         )
                     )
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/util/General.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/util/General.kt
index e54ceff..d01071f 100644
--- a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/util/General.kt
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/util/General.kt
@@ -1,8 +1,17 @@
 package io.github.samarium150.mirai.plugin.driftbottle.util
 
 import io.github.samarium150.mirai.plugin.driftbottle.MiraiConsoleDriftBottle
+import io.github.samarium150.mirai.plugin.driftbottle.config.AdvancedConfig
+import io.github.samarium150.mirai.plugin.driftbottle.config.GeneralConfig
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
+import net.mamoe.mirai.contact.Contact
+import net.mamoe.mirai.contact.Group
+import net.mamoe.mirai.message.data.At
+import net.mamoe.mirai.message.data.MessageChain
+import net.mamoe.mirai.message.data.PlainText
+import net.mamoe.mirai.message.data.toMessageChain
 import java.io.BufferedOutputStream
 import java.io.File
 import java.io.FileOutputStream
@@ -33,3 +42,22 @@ internal suspend fun File.saveFrom(url: String) = withContext(Dispatchers.IO) {
         }
     }
 }
+
+internal val randomDelay: suspend () -> Unit = {
+    val (low, high) = GeneralConfig.randomDelayInterval
+    if (low <= high)
+        delay((low..high).random())
+}
+
+internal fun disableAt(messageChain: MessageChain, subject: Contact): MessageChain {
+    return if (AdvancedConfig.disableDirectAt) {
+        val group = if (subject is Group) subject else null
+        val chain = messageChain.toMutableList()
+        for (i in 0 until chain.size) {
+            val message = chain[i]
+            if (message is At)
+                chain[i] = PlainText(message.getDisplay(group).replace("@", "At(").plus(")"))
+        }
+        chain.toMessageChain()
+    } else messageChain
+}
diff --git a/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/util/Throttle.kt b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/util/Throttle.kt
new file mode 100644
index 0000000..29b4193
--- /dev/null
+++ b/src/main/kotlin/io/github/samarium150/mirai/plugin/driftbottle/util/Throttle.kt
@@ -0,0 +1,17 @@
+package io.github.samarium150.mirai.plugin.driftbottle.util
+
+import kotlinx.coroutines.sync.Mutex
+
+private val throttleMap = mutableMapOf<Long, Mutex>()
+
+private fun getLock(id: Long): Mutex {
+    return throttleMap.getOrPut(id) { Mutex() }
+}
+
+fun lock(id: Long): Boolean {
+    return getLock(id).tryLock()
+}
+
+fun unlock(id: Long) {
+    throttleMap.remove(id)?.unlock()
+}