名词
中文翻译：Unknown
同义词：
['alert', 'warning', 'indication', 'echo', 'reverberation例句：1. The traffic policeofficer used a red light to remind driversto slow down.（交通警察用红灯来提醒司机减速。）2. The doctor gave her aninjection as a precautionary measure.（医生给她注射了一针，作为预防措施。）']
例句：
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2. 提醒；警告；提示3.
在通信中
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1. The traffic policeofficer used a red light to remind driversto slow down.
交通警察用红灯来提醒司机减速。
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2. The doctor gave her aninjection as a precautionary measure.
医生给她注射了一针，作为预防措施。
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3. The soundof the bell echoed through the emptyhall.
钟声在空荡荡的大厅里回响。