求let alone具体用法

let alone Not to mention; much less:
更不用提；更别说： “Their ancestors had been dirt poor and never saw royalty, let alone hung around with them”(Garrison Keillor)
“他们的祖先穷得要命，从来没有见过拿戚晌王消锋族成员，更不用说和他们在一起了”(加仔悄里森·谢勒)

There isn't enought room for us, let alone six dogs and a cat
I haven't decided on the menu yet, let alone bought the food.
I haven't decided where to go, let alone when to leave.

不好吧，你指的更不必说 是于前面的绝樱乎”消失了”做对比并悉的颂袭．应该改为More and more rituals and ceremonies have disappeared with the development of society in recent years, let alone determined people's positions.