Where have you been these days, Jack?杰克，你这几天去哪了？I've been to Shanghai on business.我去上海出差了。I came back just now.刚刚才回来。How did you go there?你怎么去的？I took the train.我乘火车去的。Oh, you look tired.噢，你看起来很累。Have a good rest.好好休息吧。OK. Thanks.好的，谢谢。