big underground cavity 地下大型洞室
underground cavity group 地下洞室群
underground cavity layout 地下洞内布置
underground cavity survey 井下空硐测量
underground cavity complex 地下洞室群
underground cavity and river 地下洞河
large scale underground cavity 大型地下洞室
Salt caverns are underground cavity formed by drilling and water circular melting salt in underground salt layer.
盐穴就是在地下盐层中通过钻井，利用水循环的方法，将盐层溶解，最终形成一个体积较大的空洞。
Heavy rains from tropical storm Agatha may also have overloaded underground sewage or drainage pipes, leading to a growing cavity that eventually collapsed, Bonis speculated.
博尼斯推测，热带风暴“阿加莎”带来的强降雨，同时也加重了地下排水管道的负担，致使不断变大的地下洞穴最终塌陷。
Natural sinkholes generally form when heavy, water-saturated soil causes the roof of an underground limestone cavity to collapse, or when water widens a natural fracture in limestone bedrock.
一般自然灰岩坑形成机理是由于有份量的水饱和土导致地下石灰岩洞顶层坍塌，或者由于水加宽了石灰岩床的天然裂缝而导致。
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