during that time与at that time有什么区别?

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duringthattime与atthattime有什么区别?duringthattime与atthattime有什么区别?duringthattime与atthattime有什么区别?during:

during that time与at that time有什么区别?
during that time与at that time有什么区别?

during that time与at that time有什么区别?
during:表示一段时间
at:表示一个时间点
你能说during a week,但是不能说at a week