scum
US
UK scum n: uncountable (muck on surface of liquid)
SC 浮渣 fú zhā
SC 浮垢 fú zhā，fú gòu
Boil the pulses hard for ten minutes, then reduce the heat and remove any scum from the surface of the water.
豆子用清水煮沸十分钟，然后将火关小，撇去水面的浮渣。
scum n: figurative, pejorative, invariable (worthless person) (比喻)
SC 人渣，渣滓 rén zhā，zhā zǐ
After the way Nicholas behaved, Marilyn thinks he's scum. The politician promised tougher policies to remove these scum from our streets.
见到尼古拉斯的行为后，玛丽莲认为他是个人渣。那位政客承诺会采取更加严厉的政策，清除社会上的人渣。
pond scum n: uncountable (algae living in pond water)
SC （池塘上漂浮的）绿藻 chí táng shàng piāo fú de lǜ zǎo
It is possible to treat pond scum without using dangerous chemicals.
the scum of the earth n: pejorative, uncountable, invariable, slang (despicable person)
SC 社会渣滓，人渣 shè huì zhā zǐ，rén zhā
TC 社會渣滓
TC 社會渣滓
You can't be serious about marrying him – he's the scum of the earth! Some people consider tax collectors the scum of the earth.
scum-sucking adj: slang, figurative, pejorative (despicable, contemptible)
SC 卑劣的，可鄙的 bēi liè de ，kě bǐ de