通过对设计过程的介绍，阐述了基于设计硬点和主断面的车门设计思路。
On the basis of design process introduction, the door design ideas based on hard points and principal sections are elaborated.
在硬岩中中隧道可采用凿岩台车钻眼，进行全断面开挖。
Tunnel in hard rock may be excavated in whole section by using chiseling rock trolley to drill small holes.
计算每个椎间隙处的硬膜囊横断面积。
Thecal sac cross-sectional area was calculated at each disc space.
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