1
[DET 限定词]两个；两个都 You use
both when you are referring to two people or things and saying that something is true about each of them.
[DET pl-n]
[QUANT of pl-n]
[n PRON]
[PREDET det pl-n]
[emphasis]
She cried out in fear and flung both arms up to protect her face...
她吓得大叫，并且抡起双臂护住了自己的脸。
Put both vegetables into a bowl and crush with a potato masher.
把这两样蔬菜都放进一个碗里，然后用捣土豆器把它们捣碎。
- Both is also a quantifier.
Both of these women have strong memories of the Vietnam War...
这两位妇女都对越南战争记忆深刻。
We're going to Andreas's Boutique to pick out something original for both of us.
我们要去安德烈亚斯礼品店为我们俩挑选一些新奇玩意儿。
- Both is also a pronoun.
Miss Brown and her friend, both from Stoke, were arrested on the 8th of June...
布朗小姐和她的朋友于6月8日被逮捕，她们两人都来自斯托克。
Will there be public-works programmes, or community service, or both?
将会实施公共工程项目还是社区服务项目，还是二者都有？
- Both is also an emphasizing pronoun.
He visited the Institute of Neurology in Havana where they both worked...
他访问了两人都曾工作过的哈瓦那的神经病学研究所。
'Well, I'll leave you both, then,' said Gregory.
“好吧，那我就不打扰你们俩了。”格雷戈里说道。
- Both is also a predeterminer.
Both the band's writers are fascinating lyricists...
乐队的这两位作词人都是非常出色的填词高手。
Both the horses were out, tacked up and ready to ride.
两匹马都牵出来装上了马具，可以骑了。
2
[CONJ-COORD 连词]不仅…而且…；…和…都；既…又… You use the structure
both...and when you are giving two facts or alternatives and emphasizing that each of them is true or possible.
Now women work both before and after having their children...
现在妇女在生孩子前后都要去工作。
Any such action would have to be approved by both American and Saudi leaders.
任何这样的行动都必须获得美国和沙特领导人双方的批准。
Usage Note :
Notice that all these sentences mean the same thing: Both boys have been ill', 'Both the boys have been ill', 'Both of the boys have been ill', 'The boys have both been ill'. You cannot say 'Both of boys have been ill', although when a pronoun is used, you can say 'Both of them have been ill'. See also note at all.
注意以下各句含义相同：Both boys have been ill, Both the boys have been ill, Both of the boys have been ill, The boys have both been ill（两个男孩都病了）。不能用 Both of boys have been ill，但在和代词一起使用时可以说 Both of them have been ill（他们两个都病了）。亦见all词条下的说明。