/'aɪðə(r), 'i:ðə(r); `iðɚ/
indef det, indef pron one or the other of two （两者中的）一个.
(a) (det)
*You can park on either side of the street. 在街道的哪边停车都可以.
* Keep either one of the forms. 两张表格保留哪张都行.
* There's a staircase at either end (ie both ends) of the corridor. 走廊两端都有楼梯.
(b) (pron) (used with a sing v 与单数动词连用)
*I've bought two cakes you can have either. 我买了两块蛋糕--你要哪块都行.
* Take one of the books on the table either of them will do. 从桌上拿一本书--两本中哪本都可以.

indef adv
1 (used after two negative vs 用于两个否定式之後)
*I don't like the red shirt and I don't like the green one either, ie I dislike both the red shirt and the green one. 我不喜欢这件红衬衫, 也不喜欢这件绿衬衫.
* Mary won't go and Peter won't go either. 玛丽不去, 彼得也不去. (Cf 参看...and neither will Peter. )
* He can't hear and he can hardly speak either. 他既听不见也几乎不能说话. =>Usage at also用法见also.
2 (used to emphasize a negative phrase 用于强调含否定意义的短语)
*I know a good Italian restaurant. It's not far from here, either. 我知道一家很好的意大利餐馆, 离这儿并不远.
3 either...or... (used to show a choice of two alternatives 用于表示在两个可能性中任择其一)
*either French or Spanish 或法国的或西班牙的
* I left it either on the table or in the drawer. 我不是把它放在桌子上了, 就是放在抽屉里了.
* You can either write or phone to request a copy. 既可以写信也可以打电话索取一本.