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1·It can run at the speed of up to 50 km/h on the tracks.

它在轨道上运行的速度能达到每小时50公里。

2·Even if ET has mastered building a rocket that can travel at the speed of light, he may be lying dead inside a weakened craft .

即使外星人已经掌握了制造一枚能以光速飞行的火箭的技术，他也可能死在了一架飞船里。

3·Today people and goods travel by jet aircraft and fast ships, and information is transmitted at the speed of light over the Internet.

人和货物通过喷气式飞机和快船来流动，而信息是通过互联网以光的速度传送。

4·If you could move at the speed of light, your time would stand still, if you could move faster than light, your time would move backward.

如果你能以光速运动，你的时间就会静止不动；如果你能以快于光速的速度运动，你的时间就会倒退。

5·Shared memory provides the fastest method of interprocess communication, because it processes read and write messages at the speed of memory transfers.

共享内存提供了最快的进程间通信方法，因为它以内存传输的速度来处理读写消息。

6·The electron is not moving at the speed of light.

电子不是以光速运动的。

7·At the speed of Goda's camera, there isn't enough light to magnify.

当达到Goda的这个相机的速度时，已经没有足够的光来放大了。

8·They participate others' journey at the speed of 15 thousand replies per day.

以每天15000条的回复参与他人的旅行。

9·Light travels faster than sound at the speed of 300,000 kilometres per second.

光速比声速要快，为每秒钟30万公里。

10·Radiation: composed of massless or nearly massless particles that move at the speed of light.

辐射：由以光速运行的无质量或近无质量粒子所构成。