难题

难题 [nán tí]

1. ■ difficult problem; a hard nut to crack; aporia; poser; hot potato; facer; headache; stinker; teaser; ticklish problem:

出难题 set difficult questions;

处理难题 handle a hot potato;

如何提高产品质量对他来说可是个难题。 How to improve the quality of products was a difficult problem to him.

这道题看起来很简单， 但当你要解它时你就会发现它确实是一道难题。 The problem looks simple enough, but when you come to try and solve it you'll find it's a real teaser.