foam [fəʊm]

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n.泡沫，起泡沫；vi.起泡沫；吐白沫；起着泡沫流；vt.使起泡沫；使成泡沫状物

a mass of very small bubbles formed on the surface of a liquid

The glass of beer was mostly foam. 这杯啤酒大部分是泡沫。
The surface of the water is full of foam. 水面都是泡沫。