How do you do?

您好。

But if you go to the eastern provinces, or go to some country areas.

但是如果你到东部的一些省或到乡下的一些地区去的话。

Well, we listened to lectures about pollution, agriculture, nuclear waste, radiation and so on.

噢，我们听取有关污染、农业、核废料、辐射等讲座。

There isn't any trouble. I'm just waiting for my change.

没事儿。我只是等着找钱。

I hope you have a good journey back to Guangzhou.

祝你回广州时一路顺风。

I joined in the march and we were marching peacefully along and then the police came up.

我参加了游行，我们以和平的方式往前行进，这时警察突然来了。