That is to say 一般用于什么情景?

That is to say 一般用于什么情景? that is to say什么意思l that is to say. that is to say be to do sth 一般用于什么样的情景 , that is to say = that's to say 吗? is to say B、that was to say C、it is to say D、that is to say it is to say that 和it is said that 有什么区别? To say that .is to say nothing是什么意思 that is to say是连词吗 英语翻译等于 That is to say..... that is to say ,的疑问句?