be on sentry duty是什么意思，be on sentry duty的翻译，be on sentry duty音标、读音、用法和例句

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be on sentry duty是什么意思，be on sentry duty的翻译，be on sentry duty音标、读音、用法和例句_乐豆毛深蓝词典

be on sentry duty

基本解释