It will travel around the Earth at a height of 300 km.

它将在300千米的高度绕地球运行。

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The Moon is in orbit around the Earth at an approximate distance of 377, 000 km (234, 000 miles).

月亮所运行的轨道距离地球约为377,000公里（234,,000英里）。

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The near side is always facing Earth and the far side is always facing away, because the moon revolves around the Earth at the same rate that it rotates on its own axis.

近地半球总是面对地球，远地半球总是远离地球，因为月球在绕地球旋转的同时，它也在以同样的速率绕自己的轴自转。

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On Friday, Phobos-Grunt was moving around the Earth at an altitude that varied between 177km (perigee) and 224km (apogee).

BBC: Video tracks stricken Mars probe

Dragon's rendezvous systems had never been tested before in the harsh conditions of space, with the station and the capsule racing around the Earth in tandem at about 17, 000 miles an hour.

WSJ: SpaceX Craft Rehearses Moves

This afternoon, NASA estimated that the CMEs will collide with Earth at around 1:25 AM EST on the morning of March 8.

FORBES: NASA Reports That Solar Flares Could Disrupt Power, Communications