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。
2
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。
3
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.