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against的用法Riskscanonlybeinsuredagainstiftheycanbesoestimated.against是个介词,两个介词用在一起是什么意思?againstif好象没这种答配.Theinsurerwillpayasumofmoneyorcompensationforloss,iftheriskore

题目详情
against 的用法
Risks can only be insured against if they can be so estimated.
against 是个介词,两个介词用在一起是什么意思?against if 好象没这种答配.
The insurer will pay a sum of money or compensation for loss,if the risk or event insured against actually happens.
这里的against是什么意思,在句子中的作用如何?(insured 修饰 risk or event)
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答案和解析
insure 本身是和against搭配使用的.
比如
insure one's house against fire
给房屋保火险
It is advisable to insure your life against accident.
"最好参加人寿保险,以防意外."
My house is insured against fire.
我的房子保了火险.
1.if不是介词,而是引导条件状语从句的连接词.
2.insured既修饰risk也修饰event.因为if从句中risk和event均是主语.