either是英语中具有多重词性的常用词汇，包含连词、代词、副词、限定词及形容词五种词性，英式音标为[ˈaɪðə(r)]，美式音标为。作为连词时通常与'or'连用，表示多个可选项中的单一选择，也可用于否定句表示两者都不；作代词可指代两者中的任一对象或否定语境下的两者均不；副词功能涵盖否定句中的‘也不’及补充信息的‘而且’；短语搭配包括either-or、Either way等应用形式。
单词释义
英 [ˈaɪðə(r)] 美 [ˈiːðər]
conj. 或者，要么；两者都（不），既（不）
pron. （两者之中）任意一个；两者都（不）
adv. 也（不），亦（不）；而且，还
det. （两者中的）每个，各方
adj. （两者中的）每个的，各方的
词典双解
柯林斯英汉双解大词典
either /ˈaɪðə, ˈiːðə/ CET4 TEM4
2.CONJ You use either in a negative statement in front of the first of two alternatives to indicate that the negative statement refers to both the alternatives. 用于否定句中，表示“两者都不”
3.PRON You can use either to refer to one of two things, people, or situations, when you want to say that they are both possible and it does not matter which one is chosen or considered. 用于表示“两者中的任一个”
4.QUANT Either is also a quantifier. 用于表示“两者中任一…” [QUANT 'of' def-pl-n]
5.DET Either is also a determiner. 用于表示“两者中任一…”
6.PRON You use either in a negative statement to refer to each of two things, people, or situations to indicate that the negative statement includes both of them. 用于否定句中，表示“两者中任何一个都不” [with brd-neg]
7.QUANT Either is also a quantifier. 用于否定句，表示“两者中任何一个…都不”
8.DET Either is also a determiner. 用于否定句，表示“两者中任一…都不”
9.ADV You use either by itself in negative statements to indicate that there is a similarity or connection with a person or thing that you have just mentioned. 用于否定句，表示“也不”，与刚提过的人或事物类似或有关联 [ADV after v, with brd-neg]
10.ADV When one negative statement follows another, you can use either at the end of the second one to indicate that you are adding an extra piece of information, and to emphasize that both are equally important. 用于否定句中提供附加信息，表示“也不” [ADV after v]
11.DET You can use either to introduce a noun that refers to each of two things when you are talking about both of them. 用于引出名词，表示“两者中每一个”
短语搭配
either-or
非此即彼 ; 两者择一 ; 二者择一 ; 二选一
Either way 任何的决定 ; 无论哪种方式 ; 世界尽头的养路工 ; 要不这样
either make or break
不成功，便成仁 ; 便成 ;
破釜沉舟either or 或运算 ; 其一的 ; 不是 ; 选择
part of either party 服务合同
Either You're Wrong 无论你是对是错
either-rotation motor 双向电机 ; 双向机电
In either Paris or Rome 在巴黎或者罗马 ; 而我只想回家 ; 不论在巴黎或是罗马 ; 不在巴黎也不在罗马
either of 两者选一 ; 两者之一 ; 之一
双语例句