用介词on。表示具体某天的晚上，night 前面用介词 on。如：

We usually go out on the town on Friday nights. 我们通常在周五晚上出去狂欢?

Having to work on Saturday night is the pits. 星期六晚上还要工作简直是糟透了。

It is a bore having to go out again on a cold night like this. 像今天这样的夜晚还得出门真烦死人。

The heat from the fire feels good on a cold night. 在寒冷的夜晚火炉散发的热气使人感到很舒服。

Our family sits around the fireplace on cold winter nights. 在寒冷的冬夜，我们一家人围着壁炉坐着。