booster

n 1 thing that boosts 令人鼓舞的事物: a morale booster, ie sth that makes one feel more confident 精神鼓舞. 2 device for increasing power or voltage 增强动力或电压的装置. 3 (also `booster rocket) rocket used to give initial speed to a missile or spacecraft 助推火箭（给予导弹或航天器以初速度的）. 4 dose or injection (of a medicine or drug) that increases the effect of an earlier one 辅助药剂, 增效药剂（用以加强前次药剂效力的）.

booklet, bookmark (also bookmarker), bookmobile, books, bookseller, bookshelf, bookshop (US also bookstore), bookstall, bookstore, bookworm, boom, boom town, boomerang, booming, boon, boor, boorish, boorishly, boorishness, boost, boot, bootee, booth, bootlace, bootleg, bootlegger, bootless, bootstrap, booty, booze, booze-up, boozer, boozy, boracic, borage, borax, Bordeaux, border, border on, borderer,