| 1. | In a uniform medium light travels in straight lines .
在均匀介质中光沿直线传播。 |
| 2. | Light travels faster than sound .
光比声音传播得快。 |
| 3. | Light travels faster than sound .
光比声音速度快。 |
| 4. | Early in life we learn that light travels in straight lines .
早先在生活中我们就知道光是直线传播的。 |
| 5. | The light travels in a composite medium made up of the film, the substrate and the cladding .
光在由薄膜，衬底和覆盖层组成的混合介质中传输。 |
| 6. | A light-year is the distance light travels in one year at a speed of 299, 792 kilometers per second .
一光年是光以每秒299792公里的速度在一年中所走过的距离。 |
| 7. | Our physical picture of guided light propagation is that of light traveling in zigzag fashion through the film .
导波光的传播的物理图象就是光按Z字形方式通过薄膜传输。 |
| 8. | Light and shade come in swift alternation ; days and months flash by as quickly as a weaver 's shuttle. ; light travels like an arrow , and time like a shuttle .
日月如梭。 |
| 9. | He said that light travels much faster than sound
他说光传播比声音传播快得多。 |
| 10. | Light travels at a speed of 300 , 000 km per second
光以每秒30万千米的速度传播。 |
