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1·It is about five kilometers away.

大约有五公里远。

2·Keya covers 582,646 square kilometers.

科亚占地582，646平方公里。

3·The Silk Road covered almost 6500 kilometers.

丝绸之路长达近6500公里。

4·This reservoir extends a good five kilometers.

这个水库足有5公里。

5·The Silk Road was about 6,500 kilometers long.

丝绸之路大约有6500公里长。

6·It's about 200 kilometers long and 240 kilometers wide.

它大约200公里长，240公里宽。

7·After a couple of kilometers, she drove out of the storm.

几公里后，她驶离了风暴。

8·The island is about one thousand kilometers from the North Pole.

这个岛离北极大约有一千公里。

9·The fulmars travel some 400 kilometers over the sea to find food.

管鼻鹱在海面上飞行大约400公里寻找食物。

10·The capital city has an area of less than 1507 square kilometers.

首都的面积不到1507平方公里。

公里

1·It is about five kilometers away.

大约有五公里远。

2·Keya covers 582,646 square kilometers.

科亚占地582，646平方公里。

3·The Silk Road covered almost 6500 kilometers.

丝绸之路长达近6500公里。

4·The Silk Road was about 6,500 kilometers long.

丝绸之路大约有6500公里长。

5·This reservoir extends a good five kilometers.

这个水库足有5公里。

千米

1·Eleven point two kilometers per second, at which satellites can be freed from the gravitation of the earth, is called escape speed.

卫星以11.2千米每秒的速度前进可以脱离地球引力，这被称为“逃逸速度”。

2·The most widely accepted value for the Hubble constant right now is 72 kilometers per second per megaparsec, obtained by the Hubble Space Telescope.

目前哈勃常数最被广泛认可的值是每秒每百万秒差距72千米，这个值是由哈勃空间望远镜测出的。

3·Atoms and molecules above 50 kilometers in the atmosphere are excited by sunlight during the day, and then release this energy at night, producing primarily green light that is observable from orbit.

白天，50千米以上的大气层中原子和分子吸收太阳光的能量，夜晚又将这些能量释放出来，主要产生出我们从轨道上看到的绿色光。

4·Voyager 1 is moving the fastest though, escaping the solar system at about 17 kilometers per second.

而航行者1号是速度最快的，正以约每秒17千米的速度脱离太阳系。

5·The ancient city, with its huge walls, terraces and ramps, covers an area of about 126 square miles (326 square kilometers).

这个古老的城市，有着庞大的墙壁，露台和坡道，覆盖面积约为126平方英里(326平方千米)。

(1)square kilometer平方公里