名词
中文翻译：泡沫
同义词：
['foam', 'bubble例句：1. The foam on the surface of the milk was so thick that it was hard to stir.（牛奶表面的泡沫太厚了，搅拌起来很困难。）']
例句：
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1. The foam on the surface of the milk was so thick that it was hard to stir.
牛奶表面的泡沫太厚了，搅拌起来很困难。
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2.The bubbles in the water were so small that they couldn't be seen with the naked eye.
水里的气泡太小了，肉眼看不见。
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3. The bubbles burst and the liquid returned to its original state.
气泡破裂后，液体又恢复了原状。