| 1. | Light sets the speed limit for nature .
光速限定了自然界的速率极限。 |
| 2. | The inverse of its slope is the speed of light .
其倾斜的倒数是光速。 |
| 3. | The speed of light is an invariant constant .
光速是一个不变常数。 |
| 4. | We cannot dispense with the idea of the speed of light .
我们不能废弃光速这个概念。 |
| 5. | The speed of light turns out to be nature's speed limit .
光速原来是自然界的速度极限。 |
| 6. | The velocity of light is about 300,000 kilometres per second .
光速约为每秒30万公里。 |
| 7. | The earth moves at a crawl compared with the speed of light .
与光速相比，地球也只是在爬行。 |
| 8. | The speed of light plays a special role in relativity theory .
光速在相对论中起着特殊的作用。 |
| 9. | The constancy of the speed of light seems, at first thought, unremarkable .
光速恒定，初看起来好像很平常。 |
| 10. | In a vacuum, gamma rays travel in straight lines with the speed of light .
真空中，射线以光速沿直线前进。 |
