| 单词 | 警报响起时 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔evacuate〕When the alarm sounds, you must evacuate the building by one of the designated exits.警报响起时, 你们必须从其中一个指定出口撤出那座大楼。外研社新世纪〔siren〕When the air raid siren went off people ran to their shelters.空袭警报响起时，人们纷纷跑向掩蔽所。剑桥高阶〔undressed〕I was undressed when the fire alarm went off.火灾警报响起时，我未穿衣服。韦氏高阶 |
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