cavern group
短语词组
- underground cavern group 地下洞室群
- large cavern group 大型洞室群
- a huge underground cavern group 大型地下洞室群
- large -scale underground cavern group 大型地下洞室群
- a large -scale underground cavern group 大型地下洞群
- large group -cavern 大型洞群
- group -cavern excavation 洞群开挖 返回 cavern group