1.by the time 等到
例句:By the time I came on the scene, it was all over.
我来到时, 一切都结束了。
2.step on 踩上,踏上
例句:Did I step on your foot?
我踩了你的脚吗?
3.by no means 绝不,并没有
例句:This is by no means a regular rule.
这并不是一成不变的规律。
4.dying out 衰灭消失
例句:Is the elephant really in danger of dying out?
大象当真已濒临绝种的危险了吗?
5.by the book 按常规,按照惯例
例句:He showed little initiative, handling all matters strictly by the book.
墨守成规地办一切事情。
6.by the name of 以...的名义
例句:I met a boy by the name of Tom.
我遇见一个叫做汤姆的男孩。
n. 海龟