1
- used before the first of two (or occasionally more) alternatives that are being specified (the other being introduced by 'or')或者, 要么（用来提出两个或更多选择中的前一个选择, 而后一个选择用or引出）：
either I accompany you to your room or I wait here
要么我陪你去你的房间, 要么我在这儿等着
available in either black or white.
有黑和白两种颜色可供选择。
2
- adverb, with negative used to indicate a similarity or link with a statement just made也：
You don't like him, do you? I don't either
你不喜欢他, 对么？我也不喜欢他
it won't do any harm, but won't really help either.
它没有什么害处, 但也没什么真正的益处。
2.1
- for that matter; moreover (used to add information)而且：
I was too tired to go. And I couldn't have paid my way, either.
我当时太累了, 去不了, 而且我也付不起那份费用。
1
- one or the other of two people or things（两者之中的）任何一个：
as determiner there were no children of either marriage两次婚姻都没有生孩子
as pronoun they have a mortgage which will be repaid if either of them dies.他俩有一笔抵押贷款, 任何一方死亡就得偿还。
1.1
- determiner each of two（两者之中）任一的, 各一的, 每一的：
the road was straight with fields of grass on either side.
笔直的道路两旁都有草地。
USAGE
In good English writing style, it is important that either and or are correctly placed so that the structures following each word balance and mirror each other. Thus, sentences such as either I accompany you or I wait here and I'm going to buy either a new camera or a new video are correct, whereas sentences such as either I accompany you or John and I'm either going to buy a new camera or a video are not well-balanced sentences and should not be used in written English.
短语
either way
- whichever of two given alternatives is the case（两种情况中）不论发生哪一种情况, 无论怎样：
I'm not sure whether he is trying to be clever or controversial, but either way, such writing smacks of racism.
我不知道他是想显示自己聪明还是想引起争论, 但不管怎样, 这样的文字带有种族主义的意味。
词源