The natural grade classification of loose-covered rock has a great effect on caving mining efficiency.

松散覆盖岩层的自然分级现象对使用崩落法开采的矿山开采效果有较明显的影响。

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To maintain the natural grade, the team elevated a portion of the structure using concrete columns that required minimal foundation work.

为了保持自然的地形，团队使用混凝土柱子升高了结构部分，这样只需最小的基础工作。

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Test results confirmed that the classification phenomenon of natural grade was one of properties to determine where loose-covered rocks exist.

试验研究结果证实了自然分级现象是松散覆盖岩层客观存在的性质之一。

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Dr. Riskin is the CEO of Health Fidelity, provider of a commercial-grade, cloud-based natural language processing (NLP) service, and is also a Consulting Assistant Professor of Surgery at Stanford University.

FORBES: The Next Revolution in Healthcare

They will soon bioengineer bacteria to melt oil out of tar sands, turn grass into diesel fuel and scavenge natural resources of every kind out of low-grade, thinly dispersed deposits.

FORBES: Techno-Optimism