at the end of.和by the end of 的区分at the end of.和by the end of 的区分

at the end of.和by the end of 的区分at the end of.和by the end of 的区分
at the end of.和by the end of 的区分
at the end of.和by the end of 的区分

at the end of.和by the end of 的区分at the end of.和by the end of 的区分
at the end of
在…结尾,在…末端
既可以表示时间,又可以表位置关系
by the end of
到…为止 (只能表时间） 常和完成时连用
He had finished his great works by the end of 1980.
到1980年底,他已完成了他的巨著.
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