N-PLURAL If you refer to people as scum, you are expressing your feelings of dislike and disgust for them. 令人厌恶的人 [非正式]
She never would have even spoken to scum like him when Mom was alive.
妈妈活着的时候她是绝不会和像他这样令人厌恶的人说话的。
N-UNCOUNT Scum is a layer of a dirty or unpleasant-looking substance on the surface of a liquid. (液体表面的) 浮垢
...scum marks around the bath.
…浴缸周围的垢迹。
This paper analyzes the essential scumming reasons for magnesite product and every kind of modified measures and results used normally now.
分析了菱镁制品返卤泛霜的根本原因及目前常用的各种改性措施及效果；
Through test and research for many new mixing active modifier added and new treatment method, the appearance of scumming for magnesite product is obviously inhibited on the above base.
在此基础上，通过添加多种新型混合活性改性剂及新的处理方法的试验研究，使菱镁制品返卤泛霜现象得到明显的抑制。
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