froths
n．泡沫（复数）：液体表面形成的气泡。
v．起泡沫，使起泡沫：使液体产生气泡。
例句
A horse froths his bridle.
一匹马帮他的疆绳弄上泡沫。
His mouth froths, and the froth is the word.
他正满嘴唾沫，那唾沫便是那个字了。
In the interior of the instruments, it froths up immediately and so detaches the dirt.
在仪器内部，可立即起泡沫并对污物进行分离。
