但是“地球大气层探秘”将触角伸向了更远的太空，到达了航天飞机的轨道200公里外的更高处。
ButEarth's atmosphere extends farther into space than you might realize, affecting the orbits of spacecraft more than 200 miles high.
航天飞机从飞船轨道中被调下来当作运兵车使用。
The shuttles have been called down from the starship in orbit, and are being used as troop carriers.
八点过4秒时他们看到一大块物体从航天飞机轨道器上脱离并坠落。
Four seconds after eight they saw a large piece leave the orbiter and fall away.
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