名词
中文翻译：救生圈
同义词：
['life jacket', 'lifebelt', 'lifebuoy']
例句：
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1.The children were playing in the water when a dan buoy was thrown into the lake to save them.
孩子们在水中玩耍时，有人向湖中扔了一个救生圈来救他们。
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2.The boat was capsized and everyone had to grab onto a dan buoy to stay afloat.
船翻了，每个人都必须抓住救生圈才能保持漂浮。
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3.The swimmer managed to grab a dan buoy and began to swim towards the shore.
游泳者设法抓住了一个救生圈，开始向岸边游去。