one by one:逐个地;一个接一个地;依次地。常用于描述人或事物按顺序分别进行或出现。
/ˌwʌn baɪ ˈwʌn/
Please line up and come in one by one.
请排好队,一个一个地进来。
The documents were reviewed one by one, and several serious errors were discovered that had been missed before.
这些文件被逐一审阅,结果发现了好几处以前遗漏的严重错误。
该短语由 one(一)+ by(以……方式/逐一)+ one(一)构成,字面意思就是“以一个为单位地进行”,因此引申为“逐个、依次”。这是英语中非常直观、常见的固定搭配。