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itis A gooD iDEA to Do sth
it is a good idea to do sth的中文翻译 it is a good idea to do sth 做某事是一个好主意
Actually, it's a good way to know girls when you at college,you will find it more difficult when you graduate from college.
it此处做形式主语，代替copy other's homework that不行。