much (or still) less used to introduce something as being even less likely or suitable than something else already mentioned. 用来介绍比前面提到的更不可能或更不合适的事物。 Tony can barely boil an egg, much less cook dinner. 托尼连鸡蛋都煮不好，更别提做晚饭了。 The boy didn't have a girlfriend, much less a wife. 这小伙子连女朋友都没有，更不用提老婆了。