scum

人渣、敗類、混帳口語、貶義

Anyone who steals from the elderly is absolute scum.

會偷老人東西的就是十足的人渣。

浮渣、浮沫、水垢

A layer of grayish scum had formed on the pond.

池塘表面結了一層灰灰的浮渣。

撇去浮沫、除去浮渣

Let the soup simmer and scum it every few minutes.

讓湯小火慢煮，每隔幾分鐘撇去浮沫。