剑桥词典having two different purposes 有双重作用的 This double-action lotion soothes your skin and enriches your tan . 这种具有双重功效的涂剂既能呵护皮肤还能加深晒成的棕褐色。 used to refer to a gun that needs one action for preparing to shoot it and one action for shooting it （手枪等）联动式击发的 返回 double-action