教材例句：as a six-year-old Canadian schoolboy, Ryan had trouble believing the words spoken by his teacher that many people in developing African countries couldn’t get enough clean water. 年仅六岁的加拿大男孩瑞安难以相信老师说的话—在欠发达的非洲国家，许多人都喝不到足够干净的水。
知识点分享：
1. have trouble (in) doing sth. 表示 “做某事有困难”，其中 “in” 可以省略。trouble 前可用 some, any, no, little 等词来修饰，用于描述困难的程度。
I have some trouble (in) understanding this math problem. （我在理解这道数学题上有些困难。）
They had no trouble (in) finding the hotel. （他们毫不费力地找到了那家酒店。）
拓展：当主语为物时，常用 sth. gives sb. trouble (in) doing sth. 的结构。
例如：The complex instructions gave him a lot of trouble (in) assembling the furniture.（复杂的说明书让他在组装家具时遇到了很多麻烦。）
2. have difficulty/ trouble/ problems with sth. 表达 “在某方面有困难”，后接名词或名词短语，强调在某个具体事物或领域上存在困难。
He has trouble with his English pronunciation. （他在英语发音方面有困难。）
The students had difficulty with the new vocabulary. （学生们对新词汇有困难。）
3. have difficulty/ problems in doing sth. 同样表示 “做某事有困难”，与 “have trouble (in) doing sth.” 意思相近，可互换使用，“in” 也常可省略。
We had difficulty (in) solving the puzzle. （我们在解这个谜题时遇到了困难。）
The team had problems (in) reaching an agreement. （团队在达成一致意见上有困难。）
注意：这里的 difficulty 是不可数名词，而 problem 是可数名词，所以有 “have problems in doing sth.” 这种复数形式，而 “have difficulty in doing sth.” 中 difficulty 一般用单数。
4. have difficulty/trouble with /in doing sth. 这其实是上述几种结构的混合表达，既可以表示在某方面有困难（with sth.），也可以表示做某事有困难（in doing sth.），具体含义需根据语境判断。
I have difficulty with grammar. （我在语法方面有困难。）
5. do sth. without/with difficulty 表示 “毫不费力地做某事”；“do sth. with difficulty” 表示 “费力地做某事”，描述做事情的难易程度状态。
She can play the piano piece without difficulty. （她能毫不费力地弹奏这首钢琴曲。）
He climbed the mountain with difficulty due to his injury. （由于受伤，他费力地爬上了那座山。）
拓展：可以用副词来修饰 difficulty，如 “do sth. with some/great/ extreme difficulty” 等，进一步强调困难的程度。
例如：The old man walked with extreme difficulty after the accident.（事故之后，这位老人行走极为困难。）