英语翻译There are a great many careers in which the in

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这句话翻译为
有大量的职业都越来越强调专业化了.
in which并无实在意义,楼楼问这个问题,说明并未真正搞清楚in which的用法,下面我给你讲一讲~
首先给你区分一下where.when.what.in which.which这几个常用的引导词~
what不能引导定语从句.
至于它词都是可以出现在定语从句中的,简单的说：
定语从句的关系词可以分为：关系代词及关系副词（在定语从句中需要用什么得看关系词在定语从句中所作的句子成分）
关系代词有：
who,whom,that,whose(先行词为人,在定语从句中作主语、宾语、表语及定语）
which,that,whose（先行词为物,在定语从句中作主语、宾语、表语及定语）
The boys who are playing football are from Class One.
Mr.Liu is the person (whom) you talked about on the bus.
Football is a game which is liked by most boys.
It isn’t the beautiful pig that it was.
He has a friend whose father is a doctor.
关系副词有：
when,where,why（在定语从句中作状语）
I still remember the day when I first came to the school.
Shanghai is the city where I was born.
Please tell me the reason why you missed the plane.
你的问题中提到的in which是属于“介词+关系代词”型的定语从句.
关系代词在定语从句中做介词宾语时,从句常由介词 + 关系代词（只用 whom /which）引导
The school (that/which) he once studied in is very famous.
= The school in which he once studied is very famous.
Tomorrow I will bring here a magazine (that/which) you asked for.
= Tomorrow I will bring here a magazine for which you asked.
We'll go to hear the famous singer (whom/that/who) we have often talked about.
= We'll go to hear the famous singer about whom we have often talked.
此外还有关系代词as,which引导的定语从句（先行词为一个句子或一个句子的一部分）
As is known to all,China is a developing country.
It rained hard yesterday,which prevented me from going to the park.
He is from the south,as we can see from his accent.
He has been to Paris more than several times,which I don't believe.
最后需要提醒你注意的是：as引导的定语从句可以至于句首,其它的关系词引导的英语从句都不可以,都需要放在先行词的后面.
懂了没,不懂可以hi偶~