1. have difficulty (in) doing something
例：Students often have difficulty understanding this concept.
（学生常常难以理解这个概念）
2. have trouble with something
例：She's having trouble with her math homework.
（她在数学作业方面有困难）
3. struggle with something（强调努力克服）
例：He struggles with public speaking.
（他在公开演讲方面有困难）
4. find something difficult（较正式）
例：I find it difficult to concentrate in noisy environments.
（我发现在嘈杂环境中很难集中注意力）
5. face challenges in（较正式）
例：The company faces challenges in adapting to new technology.
（公司在适应新技术方面遇到困难）
补充说明：
介词搭配：
have difficulty (in) + doing（动名词）
have difficulty with + noun（名词）
"difficulty" 作不可数名词时指抽象困难，作可数名词（difficulties）时指具体困难
根据具体语境选择最贴切的表达方式会更自然哦
