课本中不会教你的[K]422　keep out，keep up和keep up with

422　keep out，keep up和keep up with① keep out sb./sth.或keep sb./sth. out意为“使……不进入，使……在外”。也可说keep sb./sth. out of sth.。 These clothes may help you keep out the cold. 这些衣服可以帮助你御寒。（=keep the cold out） He...