stand in take sb．'s place or job for a short time代替 *she often stands in before a scene is being fimed．在正式拍摄一个场景前，她经常充当演员的替身。 *He said be would stand in for me any time．他说他随时都愿意来替代我。 *I'm standing in for the secretary while she is sick．秘书生病了，我在顶她的位置。