both

詳細解釋：

both

adj.（形容詞）
One and the other; relating to or being two in conjunction:
兩者的：一個和另一個；在連線詞中表示兩個或是兩個的：
例句：
Both guests have arrived. Both the books are torn. Both her fingers are broken.
兩個客人都已到了。兩本書都撕爛了。她的兩個手指都斷了

pron.（代詞）
The one and the other:
一個和另一個：
例句：
Both were candidates. We are both candidates. Both of us are candidates.
兩個都是候選人。我們都是候選人。我們兩個都是候選人

conj.（連線詞）
Used withand to indicate that each of two things in a coordinated phrase or clause is included:
與and連用：與and 連用以表明並列短語或從句中的兩個事物之一均包含在內：
例句：
both men and women; an attorney well regarded for both intelligence and honesty.
男人和女人；才智和聰明均受好評的律師

來源：
Middle English bothe
中古英文 bothe
from Old English b3 th3 [both those]
源自 古英文 b3 th3 [那兩個]
b3 [neuter of] bôgen [both]
b3 [] bôgen的中性 [兩個]
th3 [plural of] thôt [that] * see that
th3 [] thôt的複數 [那] *參見 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 用於表明動詞意指的行為或狀態，可單獨用於兩個實體中的任一個。 例如兩本書均重於五磅， 意指每一本書自身即重過五磅，而不是兩本書合起來才重過五磅。當動詞不能單獨用於實體中的任一個時，用both 是不恰當的。 在所有格結構中，of both 通常是更確切的： the monthers of both（他們的母親） （而不是 both their monthers ）； the fault of both（他們的過錯） （而不是 both their fault 或 both`s fault ）。 當both 與 and 在句子中用於連線平行成份時， 連線的詞或短語應在語法上保持一致：in both India and China （在印度和中國）或 both in India and in China （而不是 both in India and China ） 參見 and