The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.

地球引力减缓了月球的自转速度，使之与其轨道的速度相匹配。

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The mirrors could orbit—thousands of miles high—at the same speed as the earth turns on its axis.

这些镜子可以在几千英里的高空以地球绕地轴旋转的速度运行。

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And the weight of the spacecraft orbit, the rocket needed to provide energy and speed varies, with a variety of track between the speed of a certain relationship.

航天器的重量和轨道不同，所需火箭提供的能量和速度也各不相同，各种轨道与速度之间有一定的对应关系。

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Near the end of his third orbit, Glenn fired other rockets to slow his speed.

VOA: special.2009.06.17

Once the two GRAIL satellites are in orbit, their next step is to begin a five week phase in which they increase the speed at which they orbit the Moon.

FORBES: NASA's GRAIL Mission Will Unlock Secrets Of The Moon's Interior

The craft is meant to speed off a runway and accelerate gracefully into orbit in a single blast, perform a task like launching a satellite and then glide back home to its hangar.

BBC: Skylon: A British dream of space

Alongside the HTC-made handset are an altitude and orbit control system, two propulsion setups and a Linux-based computer with a "high-speed" processor.

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