Be prepared to discuss details and be ready to answer questions.
应随时准备好讨论细节和回答对方的疑问。
Mrs.Smith, I'd like to introduce a friend of mine, Pierre Dubois.
史密斯太太,我来介绍一下我的朋友皮埃尔=杜布斯。
But here we come up against the most difficult of all obstacles to contact with people on other planets ----the astronomical distances which separate us.