【出行必备单词】证件papers；旅行社travel agency；预定make a reservation；时刻表 timetable；票价fare；登记牌boarding pass;经济仓economy class； 落地touch down; 候机室departure lounge；头等舱 First Class；商务客舱 Business Class；单程机票 One-Way Ticket；来回机票 Round-Trip Ticket
