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said when you want to give further details or be more exact about something
那就是说;换句话说
I'll meet you in the city, that is, I will if the trains are running.
我们城里见,那就是说,只要火车还开我就会见到你。
That would mean voting no, that is to say, using the veto.
那就意味着投反对票,也就是说,行使否决权。