Imagine some friends invite you round for dinner and you have a great time chatting.

想象一些朋友邀请你去吃饭，你们聊得很开心。

He’s invited us round for dinner.

【round】他邀请我们去他家吃晚饭。

But they did not have as much food as before, and they could not invite their neighbours round, in case they didn't have as much food as them.

但他们没有以前那么多的食物了，而且他们也不能邀请邻居过来，免得他们没有以前那么多的食物了。