期货3分钟k线交易系统:what are you talking aboutzong 中文是什么意思

what are you talking aboutzong 中文是什么意思 what are you talking about 中文是什么意思 请问What were you talking about?和What are you talking about?有何区别?谢谢! You are talking nothing No matter if you can understand what are these talking about, I had no idea what you are talking about.这句话what前面为什么不加介词,比如about What are you doing? what are you doing? what are you doing? What are you?(是什么