both

形容词 both:

1. (used with count nouns) two considered together; the two

1. We can both run equally fast.
   我们两个跑得一样快。
2. She kissed him on both cheeks.
   她吻了他的双颊。
3. He has known both grief and happiness.
   忧患和快乐他都经历过。
4. Proper diet and exercise are both important for health.
   适当的饮食和运动对身体健康都很重要。
5. Good health may not only save your life, but it may save your love life as well. To bolster both, health experts advise following these6 steps.
   身体健康不仅可以挽救生命，还可以挽回你的爱情生活。要提高两者的质量，健康专家建议遵循以下6个步骤。
6. Both his eyes are hurt.
   他的两眼都受伤了。
7. Both are good.
   两者都好。
8. He is both a soldier and a poet.
   他既是个战士，又是个诗人。

both

adj.（形容词）
One and the other; relating to or being two in conjunction:
两者的：一个和另一个；在连接词中表示两个或是两个的：
例句：
Both guests have arrived. Both the books are torn. Both her fingers are broken.
两个客人都已到了。两本书都撕烂了。她的两个手指都断了

pron.（代词）
The one and the other:
一个和另一个：
例句：
Both were candidates. We are both candidates. Both of us are candidates.
两个都是候选人。我们都是候选人。我们两个都是候选人

conj.（连接词）
Used withand to indicate that each of two things in a coordinated phrase or clause is included:
与and连用：与and 连用以表明并列短语或从句中的两个事物之一均包含在内：
例句：
both men and women; an attorney well regarded for both intelligence and honesty.
男人和女人；才智和聪明均受好评的律师

来源：
Middle English bothe
中古英语 bothe
from Old English b3 th3 [both those]
源自 古英语 b3 th3 [那两个]
b3 [neuter of] bôgen [both]
b3 [] bôgen的中性 [两个]
th3 [plural of] thôt [that] * see that
th3 [] thôt的复数 [那] *参见 that

Both is used to indicate that the action or state denoted by the verb applies individually to each of two entities. Both books weigh more than five pounds, for example, means that each book weighs more than five pounds by itself,not that the two books weighed together come to more than five pounds.Both is inappropriate where the verb does not apply to each of the entities by itself. · In possessive constructionsof both is usually preferred: the mothers of both (rather than both their mothers ); the fault of both (rather than both their fault or both`s fault ). · Whenboth is used with and to link parallel elements in a sentence, the words or phrases that follow them should correspond grammatically:in both India and China or both in India and in China (not both in India and China ). See Usage Note at and
Both 用于表明动词意指的行为或状态，可单独用于两个实体中的任一个。 例如两本书均重于五磅， 意指每一本书自身即重过五磅，而不是两本书合起来才重过五磅。当动词不能单独用于实体中的任一个时，用both 是不恰当的。 在所有格结构中，of both 通常是更确切的： the monthers of both（他们的母亲） （而不是 both their monthers ）； the fault of both（他们的过错） （而不是 both their fault 或 both`s fault ）。 当both 与 and 在句子中用于连接平行成份时， 连接的词或短语应在语法上保持一致：in both India and China （在印度和中国）或 both in India and in China （而不是 both in India and China ） 参见 and