名词
中文翻译：救生衣
同义词：
['life preserver', 'lifebelt', 'survival vest']
例句：
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1. Hewas wearing a life jacket when he went into the water.
他下水时穿着救生衣。
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2.The children were safe in their life jackets as they waited for the boat to arrive.
孩子们在等待船只到来时，安全地穿着救生衣。
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3.The life jacket saved her from drowning.
救生衣救了她的命。