a tough nut to crack

意思

a problem or person that is very hard to deal with

很難對付的問題或人.

例句

1. 1This maths puzzle is a tough nut to crack, even for my dad.
2. 2The new client was a tough nut to crack, but Maria finally won his trust.
3. 3After three meetings the landlord still refuses every offer; he's a tough nut to crack.
4. 4Getting Grandad to use a smartphone is a tough nut to crack; after a month he still can't send a text.
5. 5After twenty years of failed schemes, city-centre traffic is still a tough nut to crack.

文法

名詞片語，通常用在 be 之後。to crack 保持不定詞。也可說 a hard nut to crack。

意思相近