There isn't enough room for us, let alone any guests.

连我们都没有足够的空间，更不用说客人了。

Her income was barely enough to maintain one child, let alone three.

她的收入养活一个孩子几乎都不够，更不用说三个了。

It is incredible that the 12-year-old managed to even reach the pedals, let alone drive the car.

这个12岁的小孩能够得着踏板都令人难以置信，更不用说开汽车了。

He can't ride a bicycle, let alone a motorbike.

他不会骑自行车，更别说摩托车了。

She can't ride a bicycle, let alone drive a car.

她连自行车都不会骑，更别说开小汽车了。