Rather than sloping to follow the Angle of the terrain, the route is broken up into stepped levels that zigzag across the ground to avoid touching trees.
小径的路线没有顺延基地的坡度，而是分成了几个阶梯式的标高，通过之字形道路进行连接，避免碰到树木。
2
Focal area of ground glass attenuation on LUL, which shows no remarkable interval size or configuration changes on 2 months follow-up CT scan.