What you are seeing, most likely, is a spacecraft in low Earth orbit reflecting back sunlight as it circles the Earth once every 90 minutes or so.
很可能你看到的是一艘低轨宇宙飞船反射的太阳光，因为这些航天器每90分钟左右绕地球一圈。
The astronauts could use the space station as a safe haven in the event of major problems and rotate back to Earth aboard Russian Soyuz spacecraft, eliminating the need for a shuttle rescue mission.
航天飞机升空后倘若遭遇重大故障，航天员可以将空间站作为安全的避难所并搭乘俄罗斯“联盟”号飞船返回地球，并借以取消航天飞机升空救援任务的必要性。
For asteroids too big for a robot to handle, a large spacecraft could fly near the object to act as a gravity tractor that deflects the asteroid's trajectory, sending it toward Earth.
如果行星对于机器人来说比较大的话，也可以使用一艘大型的宇宙飞船将行星拉离原有的轨道，而向着地球的方向前进。
Designing a spacecraft from scratch, says the 24-year-old part-time engineer, one of five grad students attending what's billed as the only space-architecture master's degree program on Earth.
从头设计一个飞船，这个24岁的兼职工程师这么说，他是地球上唯一培养空间建筑大师的学位课程的5个本科生中的一个。
For asteroids too big for a robot to handle a large spacecraft could fly near the object to act as a gravity tractor that deflects the asteroid's trajectory sending it toward Earth.
对于机器人无法捕获的较大的行星，则派一艘大型宇宙飞船接近，利用重力牵引使行星偏离轨道，飞向地球。
Yang said that according to what he learned the knocking sound was a result of decreasing air pressure that caused changes in the structure of the spacecraft as it left Earth for space.
杨利伟说：“我了解的情况，可能是因为我们的飞船在地面时会有压力，太空是真空无压力的环境，有可能结构会有一些变化，会产生一些声音。”
Yang said that according to what he learned the knocking sound was a result of decreasing air pressure that caused changes in the structure of the spacecraft as it left Earth for space.
杨利伟说：“我了解的情况，可能是因为我们的飞船在地面时会有压力，太空是真空无压力的环境，有可能结构会有一些变化，会产生一些声音。”
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