/bəʊθ; boθ/
adj
1 (with pl ns; the n may be preceded by a def art, a demons det or a possess det 与复数名词连用, 名词前可有定冠词、指示限定词或所有格限定词) the two; the one as well as the other 二者; 两者都
*hold sth in both hands 双手拿着某物
* Both books/Both the books/Both these books are expensive. 这两本书都很贵.
* He is blind in both eyes. 他双目失明.
* There are shops on both sides of the street. 街道两边都有商店.
* Both (her) children are at university. （她的）两个孩子都在上大学.
2 (idm 习语) have/want it/things `both ways (try to) combine two ways of thinking or behaving, satisfy two demands, obtain two results, etc which are, or might be thought to be, exclusive of each other 二者得兼
*You can't have it both ways, ie You must decide on one thing or the other. 二者不可得兼（须选择其一）. =>Usage at all1 用法见all1.

/bəʊθ; boθ/
adv ~... and... not only... but also... 不但...而且...; 既...又...; 又...又...
*be both tired and hungry 又累又饿
* She spoke both French and English. 她既会说法语也会说英语.
* Both his brother and sister are married. 他的哥哥和姐姐两人都已婚.
* She was a success both as a pianist and as a conductor. 她是出色的钢琴家和指挥家.