介绍： 版权归原作所有，仅供此学习，若有侵权请告知删除。
[12:14.04]The last reading.
[12:16.45]Applications of Lasers
[12:19.02]Lasers have numerous applications in various fields.
[12:23.93]They have made measurement an exact science.
[12:27.52]Astronomers have used lasers to measure the moon's distance
[12:31.36]fr...

介绍： 版权归原作所有，仅供此学习，若有侵权请告知删除。
[12:14.04]The last reading.
[12:16.45]Applications of Lasers
[12:19.02]Lasers have numerous applications in various fields.
[12:23.93]They have made measurement an exact science.
[12:27.52]Astronomers have used lasers to measure the moon's distance
[12:31.36]from Earth to within a few centimeters.
[12:34.45]Mappers and builders use laser technology every day.
[12:39.51]For example, drawing a perfectly level straight line
[12:43.32]on a construction site is easy using a laser.
[12:48.07]Manufacturers have used lasers for years to cut and join metal parts.
[12:53.94]And the jewelry industry uses lasers
[12:57.00]to write on the surface of the world's hardest substance, diamonds.
[13:01.85]Lasers have also changed the way we live.
[13:05.55]Super-fast Internet connections let people watch movies
[13:09.35]and send huge amounts of information at the speed of light.
[13:14.20]Laser printers can print out forms and documents quickly
[13:18.35]and are relatively low in cost.
[13:21.71]Laser barcode scanners have changed how stores record almost everything.
[13:27.68]They help businesses keep track of products.
[13:31.13]They help in storage and every detail of the supply process.