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1·If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.

如果一架宇宙飞船飞行超过每秒11公里，它就能摆脱地球引力。《柯林斯英汉双解大词典》

2·For those uninitiated in scientific ocean drilling, the previous record was a little over 4 km.

可以告诉没有海洋科学钻探知识的人，先前的纪录是四公里过一点儿。《柯林斯英汉双解大词典》

3·5 million km above the Earth.

距离地球表面5百万公里。

4·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。

5·That is one intervention about every 8,047 km of autonomous driving.

这相当于每行驶8047公里的自动驾驶里程，（驾驶员）要手动干涉一次。

6·You start by running 5 km, move up to a 10 km, then a half marathon.

你先跑5公里，再跑10公里，然后跑半程马拉松。

7·We could fly at 480 km per hour, avoiding traffic lights and busy roads.

我们可以以每小时480公里的速度飞行，避开红绿灯和繁忙的道路。

8·The longest part of the border is shared with Alaska in the USA, and it is about 2,475 km long.

边界线最长的部分与美国阿拉斯加州接壤，长约2475公里。

9·By 2020, one fifth of the country's 150, 000 km railway network will be used by high-speed trains.

到2020年，中国15万公里铁路网的五分之一将供高速列车使用。

10·Every Saturday morning, at 9 am, more than 50,000 runners set off to run 5 km around their local park.

每周六早上9点，5万多名跑步者出发，绕着当地的公园跑5公里。