名词
中文翻译：泡沫
同义词：
['bubble', 'froth', 'squirt']
例句：
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1. The foam on the surface of the milk is a sign that it has been warmed.
牛奶表面的泡沫是它已经被加热的标志。
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2. The bubbles in the water were caused by the rising air pressure.
水中的气泡是由于上升的空气压力造成的。
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3. The foam was so thick that it covered the entire surface of the pool.
泡沫非常厚，覆盖了整个泳池的表面。