Necessary Evil 必要之恶，意思是指某些你无法避免的事情，每个人都要做的事，比如去拜访他们的亲戚（有时觉得很无聊，但是不得不去）。再比如，去上班，不想去但是为求生计不得不去。
1）necessary必要的，必需的
Water is necessary fo life.
水是生命所必需的。
2）evil 邪恶的，罪恶的
The student was punished for his evil acts.
此学生因其恶行收到惩罚。
3）assume假定，假装
I assumed that she had gone for a walk.
我想她去散步了。
4）breathe呼吸，呼气，吸气
All animals breathe air.
动物全都呼吸空气。
5）share 均分，分摊，分配
The money was shared between them.
这笔钱由他们两人分。
6）avoid避开，躲开
I avoid her as much as possible.
我尽量避开她。
7）relative亲戚，亲属
My uncle is my only immediate relative.
我叔叔是我唯一的至亲。
8）boring令人生厌的，乏味的
It was boring to sit there without anything to do.
无所事事地坐在那里太无聊了。
9）work工作，劳动，作业
I have to bring my work home tomorrow.
明天我得把工作带回家做。
10）example例子，样本，样品
This book has many examples of how verbs are used.
这本书有许多关于动词用法的例句。