The cause of mine pillar destruction in in Dachang Tongkeng Tin Mine was analyzed from observation by photoelastic stressmeter embedded in mine stope 570.

通过对埋设于570中段光弹性应力计的观测，分析了该中段矿柱破坏的情况及原因。

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The paper introduces a method to use the observation technology to ascertain the width of stage coal pillar by an example.

通过一个实例介绍了用实测技术确定区段煤柱宽度的方法。

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Darwin's observation that species evolve over the course of generations through the natural selection of favourable traits has become a central pillar of biological thinking and has influenced many other fields of scientific endeavour.

BBC: NEWS | Science/Nature | Darwin 'was committed to publish'