This is the 2035th most frequent Chinese word.
难题
A difficult problem or challenge.
The term '难题' is used here to describe a challenging question that requires effort to solve, emphasizing the difficulty of the math problem.
这个数学问题对我来说是一个难题。
This math problem is a difficult issue for me.
Here, '难题' signifies a general challenge or issue in life that is not easily resolved, referring to interpersonal relationships.
如何处理人际关系是许多人面临的难题。
How to deal with interpersonal relationships is a problem many people face.
In this example, '难题' conveys challenges or obstacles that can arise during the process, referring to the development process complexities.