The roller is part of brittle material, avoid to use the way in whack, bump, impact and other easily to make mechanical stress.

辊棒属脆性材料，清理时应避免敲击、撞击、冲击以及其它易产生机械性应力的方法。

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It is shown that the compressive stress, the content of the methane of the coal, and the bump of coal and methane are directly affected by the content of the ash and the volatile of the coal.

研究表明：煤的灰分、挥发分含量直接影响着煤体瓦斯压力、含量及煤与瓦斯的突出。

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I wasn't burned out on the annual dose of noise and stress and I was only marginally aware of the colossal production road bump E3 would create for so many future projects.

我并没有被一年一次的嘈杂和紧张而搞得筋疲力尽，而只是隐约感觉到，E3给将来那么多项目所增加了巨大的阻力。

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But that bump came at a cost: increases in cortisol, a stress hormone, and a measure of inflammation called CRP, which can raise the risk of developing heart disease and diabetes.

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