给邮箱发送验证码:i want to retire by the time i am thirty

来源：百度文库 编辑：杭州交通信息网 时间：2024/04/29 09:43:47
可以帮我分析一下为何用by the time i am thirty
吗？为何不用at 或on 或in

at都是指比较具体的时间，也比较精确。
in和on无法与the time I am thirty 搭配。
by the time i am thirty最合适，by可以指过去也可以指将来。

这句话的意思是：我想在我30岁的时候退休。
By 在这里是指某一时间点。
可以译成“到……为止”
而介词at和in，on等等要比by具体的多。
如；at6：00（在6点的时候）
on sunday morning（在星期天早上）
in the evening（在晚上）

by表示时间有"不迟于""到...时"或者"在...以前"的意思

by 表示一到.....就

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