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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
