Because they destroy so many insects, and insects include some of the greatest enemies of the human race.
因为它们能消灭那么多的昆虫，其中包括一些人类的大敌，
新概念英语第四册
Lesson 2 Spare that spider
📚 句中词汇解析
从本句中提取的重要词汇
conj. 因为;
💡 cause, cuse 表原因,目的;司法程序,诉讼
"He was arrested because of his political affiliation."
他因所属政党的关系而被捕。
近义：since, whereas, for, forasmuchas
vt. 破坏，摧毁;消灭，歼灭（敌人）;杀死;使失败;
💡 de坏+stroy=struct建造 → 毁坏，破坏
"It is proverbially easier to destroy than to construct."
谁都知道破坏容易建设难.
近义：shatter, impair, kill, mar, obliterate, rack
反义：mend, refit, repair, service, tinker
vt. 包括;包含;计入;包住;
💡 in进入+clude关闭→关进去→包括
"Symptoms include diarrhoea and vomiting."
症状有腹泻和呕吐。
近义：append, attach, subjoin, adjoin, affix, enclose
反义：omit, preclude, blackball, except
n. 人，人类;
adj. 人的;有人性的;显示人类特有弱点的;人本性的;
💡 hum土,地+an名词后缀，属于...的，传说人是由土造出的 → 人类
"The teacher drew an analogy between the human heart and a pump."
老师打了个比喻，把人的心脏比作水泵。
近义：mortal
n. 赛跑;人种;竞争;民族;
v. 参加比赛;快速移动;空转;
💡 比赛跑（r=run）第一（ace，扑克a）
"Much to his chagrin, he did not win the race."
使他大为懊恼的是他赛跑没获胜.
近义：hurry, nip, run, scurry, speed, sprint
反义：pace