To whom it may concern什么情况下用?

To whom it may concern什么情况下用?
To whom it may concern什么情况下用?

To whom it may concern什么情况下用?
用作正式信件的开头
致与此文/事有关的人
求职,推荐,举报等等信件

在不知道收信的对方姓名的时候用.

to whom it may concern已经成了英语的一个习语(idiom).专用在信件开头，写给你不知道职务也不知道名字的，但同你下面要谈这件事有关的人。见下面解释和例句：
To the appropriate recipient for this message, as in I didn't know who was responsible for these complaint...

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to whom it may concern已经成了英语的一个习语(idiom).专用在信件开头，写给你不知道职务也不知道名字的，但同你下面要谈这件事有关的人。见下面解释和例句：
To the appropriate recipient for this message, as in I didn't know who was responsible for these complaints so I just addressed it “to whom it may concern.” This phrase is a formula used in letters, testimonials, and the like when one does not know the name of the proper person to address. [Second half of 1800s]

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