He had always wanted to go caving.
他过去一直想探索洞穴。
Sub-level caving is an efficient and safe mining method.
无底柱分段崩落采矿法是一种高效安全的采矿法。
The shape of the caving can indicate why the rock failure occurred.
坍塌的落石的形状可以说明岩石失稳原因。
The shape of the caving can indicate why the rock failure occurred.
坍塌的落石的形状可以说明岩石失稳原因。
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