主洞 meaning in English
master cave
Examples
- Optimal study of the main tunnel line of yin - xi - ru - lan transporting water engineering
引细入兰输水工程主洞线优化研究 - An underground cavity group has a large cross - section main cavity and many branch cavities with short intervals and various cross - sections
摘要某地下洞室群，主洞室断面很大，支洞较多，距离较近，且断面变化复杂。