hard nut的用法和樣例：
例句
- Painting the ceiling was a tough nut to crack.
油漆天花板是件難事。 - It is not hard to succeed if you work hard.
只要你努力工作，獲得成功就不是件難事。 - It's really a hard nut for us to crack.
這對我們來說是個難題。 - Some hard problems in arithmetic bewilder me.
算術上一些難題使我糊塗。 - This is a hard boy to deal with.
這是一個難對付的男孩。 - This guy's a nut and you'd better get ready for rainy days.
這個傢伙是一個難對付的人，你最好是未雨綢繆。
辭彙搭配
- hard nut to crack 棘手的事
- a hard nut to crack 棘手的問題
