名词
中文翻译：泡沫
同义词：
['bubble', 'froth', 'foam']
例句：
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1.The bubbles on the surface of the water are caused by the air trapped inside.
水面上的气泡是由于水里的空气造成的。
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2.The foam was so thick that it covered the entire surface of the pool.
泡沫很厚，覆盖了整个泳池的表面。
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3. The foam was so thick that it made swimming difficult.
泡沫太厚了，游泳变得很困难。