HSK 3 · noun · Practice
难题
difficult problem; tough question
这个难题我想了半天。
Zhège nántí wǒ xiǎngle bàntiān.
I spent a long time thinking about this difficult problem.
老师给我们讲解了这道难题。
Lǎoshī gěi wǒmen jiǎngjiěle zhè dào nántí。
The teacher explained this difficult problem to us.
团队一起攻关，解决了难题。
Tuánduì yìqǐ gōngguān， jiějuéle nántí。
The team tackled the key problems together and solved them.
他们终于攻克了技术难题。
Tāmen zhōngyú gōngkèle jìshù nántí。
They finally overcame the technical difficulty.