There is no need for you to introduce yourself again.
你没有必要再次介绍自己。
There is no need for parents to do everything for their parents.
父母没有必要为孩子做一切事情。
There is no need for wasting time.
没有必要浪费时间。
There is no need for you to work so hard.
没有必要工作这么辛苦。
there is no need for me to answer this question.
我没有必要来回答这问题。
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