by the end of 与at the end of完型填空有一题 the population will pass six billion by the end of the century .为什么不用at the end of 呢

问题描述:

by the end of 与at the end of
完型填空有一题
the population will pass six billion by the end of the century .
为什么不用at the end of 呢

at the end of+地方。是指空间上的“最后”或者是故事到了最后,都可以啦
by the end of+时间。是时间上的“最后”。用于过去完成时
(e。g:By the end of last term,we have leant 3000 words。)

by the end of意思是到什么末为止
at the end of意思是在什么末

这一对短语的意思都是“在…的末了”、“在…的一端”,意义上相似,但使用场合有所不同. 一般说来,at the end of用于表示具体事物或场所的场合,它也可以用来表示比喻意.例: The school is situated at the end of th...