trouble用作不可数名词，意为“困难”，常用于以下结构中：
1. get into trouble=be in trouble，意为“陷入困境，遇到麻烦”。如：
Stop doing that, or you’ll get into trouble(be in trouble).
别这样做，否则你会陷入困境的。
If she is in trouble, protect her.
如果她遇到麻烦，你就要保护她。
2. have trouble with...意为“在……（方面）遇到困难/麻烦”。如：
He began to have trouble with his right knee.
他的右膝盖开始出现不适。
Did she have any trouble with any of the other patients?
她和其他病患有过矛盾吗？
3. have trouble (in) doing sth.意为“做某事有困难”。如：
Many people have trouble (in) cleaning the grapes.
清洗葡萄让很多人头疼。
You have trouble (in) making decisions.
你很难做出决定。
trouble可用作及物动词，意为“使……苦恼，使……麻烦”。如：
Could I trouble you to open the window, please?
劳驾，麻烦您把窗户打开好吗？
I don’t want to trouble the doctor with such a small problem.
我不想为了这个小毛病麻烦医生。