名词
中文翻译：浮力
同义词：
['buoyancy', 'buoyant', 'float', 'rise to the surface']
例句：
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1. The boatsank and had to be floated back to the shore.
船沉了，需要被拖回岸边。
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2. The balloon floated in the sky like a bird.
气球在天空中飘浮，像一只鸟。
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3.The ship was too heavy for the current and sank.
船只太重，被水流冲走沉没了。