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一、做名词时,指一种古罗马钱币,译为阿斯,这个用法比较罕见,可以忽略。
二、as用作介词:
第一种同like,意思是“像,如同”,例如:
The bomb was disguised as a package. 炸弹伪装成一个包裹
The news came as a shock. 消息传来,令人震惊。
第二种是“作为……身份”,这个时候与like就有区别了,例如:
She works as acourier. 她的职业是导游。
She works like acourier. 她像导游一样工作。
三、as用作连词:
第一种是引导状语从句,可表时间、原因、让步、方式等,例如:
(a) As she grew older she gained in confidence. 随着年龄的增长她的信心增强了。(引导时间状语从句)
(b) She may need some help as she's new. 她是新来的,可能需要一些帮助。(引导原因状语从句)
(c) Try as he might (= however hard he tried) , he couldn't open the door. 他想尽了办法也没能打开门。(引导让步状语从句)
(d) They did as I had asked. 他们是按照我的要求做的。(引导方式状语从句,as=in the way in which)
第二种是用在“as+(形容词或副词)+as”中,其中第一个as为副词(见下文),第二个as为连词,引出关联对象:
You're as tall as your father. 你和你父亲一样高。
I haven't known him as long as you (= as you have known him).我认识他的时间没有你长。
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