Everyday Expressions We must discuss the problem of how to protect the environment. What they did produced new problems with us. It took me an hour and a half to work out this problem in mathematics. 生活用语 Street Talks According to Mr. Green, this is a complicated problem. What's the problem? Do you know? Johnny is a real problem child. A: What should I do? B: You figure it out yourself. It's not my problem. A: What's her problem? B: Don't mind her, she just lost her parents.
