英语翻译A laser is used to produce very powerful beams of light.

英语翻译
A laser is used to produce very powerful beams of light.These beams of light are so powerful that they make holes in a steel very quickly.Today laser is getting wider and wider used in more and more fields.
Why is laser so much more powerful than other kinds of light?What makes laser beams so different from other beams?
Laser is a kind of light and also a form of energy.A laser beam is made up of very short waves.These waves all have the same wave length.The laser beam keeps going on and off all the time,and is off much longer than it is on.As these changes are very fast,we can not see them.During the time laser beam is off.The energy for the next burst of light is being built up,so when the beam is on again,it will be a strong burst.And the laser beam doesn't spread,that is,it doesn't get wider as other light beams do.This is why the laser beam can keep all its energy and is so much more powerful light beams.