n. a factor causing trouble in achieving a positive result or tending to produce a negative result
n. a condition or state of affairs almost beyond one's ability to deal with and requiring great effort to bear or overcome
n. the quality of being difficult
n. 困难, 难点
1. I had difficulty understanding the instructions.
我很难理解这些指示。
2. She faced many difficulties while learning a new language.
她在学习一门新语言时遇到了许多困难。
3. The difficulty of the exam surprised all the students.
考试的难度让所有学生感到惊讶。