“a tough nut to crack”可以造什么句，a tough nut to crack造句

2、Painting the ceiling was a tough nut to crack.

4、Our boss is a tough nut to crack. We've broken our tongue about the stakes. He's still going his own way.

1、What makes the brain such a tough nut to crack?

5、That is a tough nut to crack, and all Chelsea have managed this season is to prove Ferguson correct when he suggested they were the ones with the age problem if a significant improvement was expected.

3、It'a tough nut to crack.生存是非常艰难的。