洞穴的形成需要火山气体和热量的稳定释放，海拔高到足以防止每年的大量降雪在夏季融化。
The cave-making recipe calls for a steady emission of volcanic gas and heat, a heavy annual snowfall at an elevation high enough to keep it from melting during the summer.
有时干旱也会导致类似洞穴的形成。
And also sometimes it's drought that causes this cave-like formations.
最小阻力原理控制下的地下径流的侵蚀扩容作用为洞穴的形成奠定了基础。
The effect of enlarging volume by eroding of underground runoff under the control of the principle of least resistance lays down a foundation for the formation of karst caves.
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