【句子】
because of its irritating effect on humans, the use of phenol as a general antiseptic has been largely discontinued.
由于苯酚对人体带有刺激性作用，它基本上已不再被当作常用的防腐剂了。
解析】of 因为。
because of与because的区别：
because 后面接句子，because of后面接名词或名词词组(即不成句子的）
missed her very much because he loved her.他很想她因为他爱她。
lost his job because of his age. 由于年龄关系他失去了工作。
on 1.对……的作用 2.影响。
effect 与affect的区别：
effect 是名词，“影响”,搭配短语：h**e an effect on sth.=h**e an influence on sth.对··有影响。
affect 是动词，“影响”，直接跟宾语，affect sth 对···有影响，且通常指不利的影响。
1. sandstorms sometimes affect bejing.
tv for a long time will h**e a bad effect on your eyes.要注意区别哦！
n. 1.人，人类。
a. 1.人的，人类的 2.有人性的，通人情的 3.显示人类特有弱点的；人本性的（常见词汇）
v. 1.停止；终止；中断 2.（通常用被动语态）停止，终止（生产）
upon termination of this agreement, distributor shall immediately discontinue all sales of products.
本协议终止时，分销商应该马上停止产品的销售。
练习】mary, i___john of his promise to help you.
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