VOA慢速英语:维珍银河公司报道对太空飞行高度兴趣

reservation(s) – n. an agreement to have something, such as a room, table, or seat held for your use at a later time

commercial – adj. related to or used in the buying and selling of goods and services

ticket – n. a piece of paper that permits you to see a show, take part in an event, or travel on a vehicle

billionaire – n. a rich person who has at least a billion dollars