难题 nántí difficult problem
怎么记住“难题”: 难 difficult + 题 topic = difficult problem.
汉字
用法
- A tough, knotty problem, usually abstract - 解决难题 (jiějué nántí) solve a difficult problem.
- 出难题 (chū nántí) means to pose a hard question or deliberately make things difficult for someone.
- Contrast neutral 问题 (wèntí, question/problem); 难题 stresses that it is hard to crack.
例句
- 这是一道数学难题。 Zhè shì yí dào shùxué nántí.This is a difficult math problem.