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Chinese (Traditional) translation of “a hard/tough nut to crack”

a hard/tough nut to crack

a problem that is very difficult to solve or a person who is very difficult to understand
棘手的問題;難以理喻的怪人
Difficult things and peoplePreventing and impeding
(Definition of a hard/tough nut to crack from the Cambridge English-Chinese (Traditional) Dictionary © Cambridge University Press)
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