Definition
难题 refers specifically to a problem that is difficult to solve — it always carries a sense of challenge. In contrast, 问题 is a general term for any question or issue, without implying difficulty.
noun
difficult problem
Examples
- 难题。Tā wèn le yí gè nán tí.He asked a difficult question.
- 难题。Yù dào nán tí bú yào pà.When you encounter a difficult problem, don't be afraid.
- 难题。Lǎoshī bāng wǒ zuò zhège nán tí.The teacher helps me do this difficult problem.
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