scum

noun

1. a film of impurities or vegetation that can form on the surface of a liquid

2. worthless people

Synonym: trash

verb

1. remove the scum from

1. 卑鄙的人;人渣;败类
If you refer to people as scum, you are expressing your feelings of dislike and disgust for them.

2. (液体表面的)浮渣，浮垢
Scum is a layer of a dirty or unpleasant-looking substance on the surface of a liquid.

e.g. ...scum marks around the bath.
浴缸周围的浮垢痕迹

1. 浮渣： 硬水与浮渣(scum)中四以上的同学看见硬水这个词定必想浮渣,这个在洗洁剂一课中学到的生字. 难道水中的矿物真的如此一事无成? 其实它们对我们身体健康有一定程度的影响,

2. 透明残膜：其不当之感光与半硬化(Semi-polymerization或Partial-polymerization)瑕疵.一旦此等模糊角色已发生于间距(Spacing)区中时, 在不易尽除下经常会形成透明残膜(Scum)的扩张或残足伸出进而在蚀刻后发生铜斑铜碎甚至线边的突出,

3. 泡沫,浮渣：通粉,猪润,牛肉,及肉汤特有的泡沫 / 浮渣(Scum)混成一大碗(其实所谓浮渣,就是汆水时常见的,估计应该与肉中的血不无关系(各看官有错不妨指正),因此这里的汤有大量泡沫也是意料之内,做的细心的,当然会把泡沫倒掉,