And also calculates evaluation set. The density movement curve to the farthest discovering distance of Xwave band radar is drawn and the result is analyzed.
The other type doesn't use X-rays but instead a technology called millimeter-wave scanning.
另外一种不使用X射线，而是采用了一种叫做毫米波扫描的技术。
3
Light is an electromagnetic wave, with a longer wavelength than X-rays and ultraviolet, and a shorter wavelength than infra-red, microwaves and radio waves.