The stability of drilling chamber is an important facet to ensure the safe operation of VCR mining method.
凿岩峒室的稳定性是VCR采矿法安全的重要保障。
The paper describes the sequence of mineral products used by the Chinese, mining pit and chamber, mining method and the source of the term "mineral resources".
本文叙述了中国人使用矿产品的先后次序，采矿坑峒、采矿方法及充填工艺的起源，和矿藏一词的由来。
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