名词
中文翻译：救生圈
同义词：
['life jacket', 'life vest', 'life preserver']
例句：
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1. The lifebuoy was a crucial part of the rescue operation.
救生圈是救援行动中至关重要的部分。
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2. The children were playing in the water, but one of them got into trouble and needed a lifebuoy.
孩子们在水里玩耍，但其中一个孩子陷入了麻烦，需要救生圈。
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3. The lifebuoy was so small that it could only support one person at a time.
救生圈太小了，只能一次支撑一个人。