切割金属需要用功率大的锯。
以解决大型城市配电距离长，配电功率大的问题，这在我国城市已经有先例。
To address major long-distance urban distribution, power distribution major problem, which has been found in our city.
目前大多数激光器是用硅来做反射镜，来来回回地反射激光X射线，但硅反射镜不能反射功率大的X射线。
Most lasers use silicon mirrors to bounce light wavelengths back and forth, but silicon can't reflect powerful X-rays.
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