froth
noun [ U ] uk/frɒθ/ us/frɑːθ/
(BUBBLES)
（液体表面的）白沫
small, white bubbles on the surface of a liquid
I like the froth on the top of the coffee. 我喜欢咖啡表面的那层白沫。
(NOT SERIOUS)
迷人而无价值的东西;浅薄空洞的东西
something that is not serious and has no real value, but is entertaining or attractive
His books are just froth, but they're enjoyable enough. 他的书没什么价值，但可读性还不错。
froth
verb [ I or T ] uk/frɒθ/ us/frɑːθ/
（使）起泡沫
to (cause a liquid to) have or produce a lot of small bubbles that often rise to the surface
The waves frothed as they crashed onto the beach. 浪花冲上沙滩，泛起阵阵泡沫。
When she opened and bottle of soda, it frothed up and spilled all over the table. 她打开汽水瓶的时候，泡沫冲上来，撒了一桌子。
froth at the mouth （因病）口吐白沫
If a person or animal froths at the mouth, a mass of small bubbles appears from their mouth as the result of a disease.