We have dinner at six in the evening

六点钟───At six o'clock;吃饭───having dinner

You'll be relieved at six o'clock.───六点钟有人来换你的班。

If I remember rightly , there's a train at six o'clock.───如果我没记错的话，六点钟有一趟火车。

He had them on parade at six o'clock in the morning.───他让他们在早上6点接受检阅。

The news will follow the pips at six o'clock.

After several delays we finally took off at six o'clock.

I awoke from a deep sleep at six o'clock.

We'll be leaving at six o'clock prompt.

They usually dine at six o'clock.