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1·The greatest concern the authors raise is space debris-pieces of junk that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.

两位作者提出的最大担忧是太空垃圾——环绕地球运行的“垃圾”碎片，如果它们与包括国际空间站在内的运行单位相撞，可能会造成严重损害。

2·The greatest concern the authors raise is space debris—pieces of junk that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.

作者提出的最大担忧是太空碎片，即环绕地球的“垃圾”碎片，如果它们与包括国际空间站在内的运行体相撞，将有可能造成严重损害。

3·But why does then the moon orbit the earth?

那么为什么月亮绕着地球转呢？

4·Once the Soyuz began to orbit the Earth, the failures began.

当联盟号开始环绕地球的时候，失败随之降临了。

5·Shenzhou Seven will orbit the Earth at an altitude of 343 kilometers.

神七在343公里高空的轨道绕地球飞行。

6·On February 20, 1962, Glenn became the first American to orbit the Earth.

1962年2月20日，格伦成为首位进入地球轨道的美国人。

7·The orbital module will continue to orbit the earth and carry out more experiments until its battery runs out.

卫星留轨舱在电池耗尽之前，还将在轨运行一段时间，继续进行一些科学实验任务。

8·Friendship 7, he became the first American to orbit the earth. He was elected U. S. senator from Ohio in 974, 980, and 98 '.

友谊7号航天飞船进行轨道飞行，成为第一个绕地球轨道飞行的美国人。他先后于974年、980年和98 '年当选为俄亥俄州的参议员。

9·Traveling at 17, 500 miles per hour (5 miles per second)…we orbit the Earth every 90 minutes, with a sunrise or sunset every 45 minutes.

以时速17500英里/小时（5英里/秒）飞行，每90分钟我们就绕地球飞行一圈，就是说每45分钟就日升或日落一次。

10·Pressel says that even 40 years after its original launch, Hexagon is still one of the most complicated vehicles ever to orbit the earth because it used film.

Pressel说甚至在它发射四十年后，Hexagon仍然是地球轨道上最复杂的卫星之一，因为它使用胶卷。