— used when referring to another thing that relates to what you have just said更不用说;且不说
Our favorite Italian restaurant makes its own fresh bread and salad dressing, not to mention [=in addition to] a great spaghetti sauce.我们最喜欢的意大利餐厅有自制的新鲜面包和沙拉酱,更不要说美味的意大利细面条酱了。
We were cold, wet, and hungry, not to mention [=and also] extremely tired.我们都淋湿了,又冷、又饿,更不要说极度疲劳了。