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本期内容：
Nasa has named the astronauts who will fly the first missions into space on commercially provided rockets and capsules, starting next year. The nine individuals will go up on systems developed by - and contracted from - the Boeing and SpaceX firms. Most have previous experience in orbit. Among them are the commander and pilot of the final shuttle mission in 2011.
name: vt. 提名
astronaut: n. 宇航员
commercial: adj. 商业的
capsule: n. 太空舱
contract: vt. 承包
orbit: n. 轨道
commander: n. 指挥官
shuttle: n. 穿梭运行的车辆；穿梭航班
space shuttle: 航天飞机
shuttle bus: 穿梭巴士
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