http://p0.ifengimg.com/pmop/2018/0301/8A45949F16440446D945F7B88C863C0BA4E03E83_size109_w1408_h939.jpeg
比如,要保持轴GfGC的完整性,新机FNou在整个轴线上没uwEi任何实体的遮挡CD5k保持轴线的贯通RCwv