Establish the erosive wear mechanism of drilling string in air drilling and put forward that erosion wear is a substantial cause to promote drill string failure.

初步确立了空气钻井钻柱冲蚀磨损机理，提出钻屑冲蚀是促使钻具失效的一项重要原因。

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They can cause substantial personal suffering, impaired quality of life and financial cost.

它们可造成大量个人痛苦、生活质量受损以及经济代价。

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'With a strong and shallow earthquake like this in such a populated area, it could really cause substantial damage,' he said.

他说，在这样一个人口稠密地区发生强烈的浅层地震，真的有可能造成重大破坏。

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Pneumococcal disease is a substantial cause of illness and death.

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The group said it would cause substantial harm to the architectural qualities of the building.

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Volatility is here to stay, all three experts agree, because a simple weather event can cause substantial damage.

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