啤酒倒出时会起泡沫.Beer froths when it is poured out.看上去好像一大片起泡沫的污水.It looked full of billowing dirty washing.肥皂在海水里不起泡沫.Soap will not lather in sea - water....

“起泡沫”的英语可以翻译为：[化] effervescence，spumescence ...