难题[nán tí]
difficult problem; a hard nut to crack; aporia; poser; conundrum
例句
1.软件公司爱招募那些喜欢解决技术难题的人们。
Software companies love hiring people that like solving hard technical problems.
2.慢性病已经成为贫穷和中等收入国家的最大难题。
Chronic disease is already the biggest problem for poor and middle-income countries.
3.另一个理论难题是进入拍卖。
Another theoretical conundrum is entry to the auction.
4但这里存在一个难题。
But there is a catch.
5.难题是要帮助创建并支持一个正常运转的政府。
The challenge is to help create and support a functioning government.
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