苏州家林电器有限公司:by the end of 和 at the end of 有什么区别?

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by the end of .. 快将(刚好)完结时
at the end of ...已完结后

She fell asleep by the end of the lesson. 她在课堂快将完结时便睡著了.
She fell asleep at the end of the lesson. 她在课堂完结后便睡著了

by the end of 到...为止(...之前都在允许范围内,一般和完成时连用)
at the end of 在...的最后(表点时间,不能用完成时)

by the end means until the end of which can be considered as during a period of time.
at the end of represents at a point time or location.

直到····结束时(一段时间)
在·····结束时(某个时间点)

by the end of只能用于时间
at the end of还能用于空间

前者用于过去完成式;直到····结束时(一段时间)

后面的 是 一般过去式;在·····结束时(某个时间点)