劍橋詞典having two different purposes 有雙重作用的 This double-action lotion soothes your skin and enriches your tan . 這種具有雙重功傚的塗劑既能呵護皮膚還能加深曬成的棕褐色。 used to refer to a gun that needs one action for preparing to shoot it and one action for shooting it （手槍等）聯(lián)動式擊發(fā)的 返回 double-action