'Whose' for things. / 'Their' for things.

Whose를 물건에 쓸 수 있나? 

 

https://www.merriam-webster.com/words-at-play/whose-used-for-inanimate-objects

 

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아래 출처.

 

The general rule is that, when talking about things, you use 'its' for singular and 'their' for plural. There is one exception relating to their, for which the Oxford Dictionary defines two usages:

1. of or belonging to people, animals or things that have already been mentioned or are easily identified

2. used instead of his or her to refer to a person whose sex is not mentioned or not known

As 米凯乐 stated, when you use each, you must use a singular, and the first usage is only valid for plural things. The second usage is valid for singular, but only for a person, not for things. You therefore cannot use their in this sentence, because it is a thing and must be singular: you should use 'its'.

 

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米凯乐(mikkeller)

 

개선하다.

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