| 1. | Lasers can also be used to purify materials .
激光还可以用于材料提纯。 |
| 2. | Laser beams may cauterize and heal ulcers .
激光束可以烧灼和愈合溃疡。 |
| 3. | All rays leaving the laser are in phase .
由激光发射出的光线都是同位的。 |
| 4. | Laser beams are also used in surgery .
激光束还可用于外科手术。 |
| 5. | How does a laser beam vaporize steel ?
激光束是怎样使钢气化的？ |
| 6. | A laser is a device composed a special material .
激光器这种器件是用特殊材料制成的。 |
| 7. | The beam from the laser l passes through the shutter s .
激光器L发出的光束经过快门S。 |
| 8. | Laser light does not spread out even at great distances .
激光即使经过很远的距离也不会扩散。 |
| 9. | The first liquid laser was operated in january of 1963 .
第一个液体激光器是在1963年1月运转的。 |
| 10. | Lasers are finding increasing application in medical science .
在医学上，激光得到日益增多的应用。 |
