The II3123 face is a light type caving face of three-soft coal seam. the roof is cracked, sloughing and roof fall often occur.

前言： 石台煤矿II3123工作面为“三软”煤层轻放工作面，顶板破碎易掉，片帮、冒顶时常发生。

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The sound emission characteristics and the causes for incorrect prediction of the stope roof fall at Tonglushan Mine were analysed.

对铜绿山矿采场冒顶的声发射特征和预报不准的原因进行了分析。

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The compound roof fall accident of the individual hydraulic prop face is analyzed. The accident mechanization and prevention method are pointed.

对单体支柱工作面复合型顶板推垮型事故进行了分析，提出了事故发生的机理和预防办法。

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But it sure can dish up some compensating amusement while we wait for the roof to fall in.

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Biologists are still running modelling experiments to determine whether to save the Wedgwood or leaded crystal as the house smoulders and timbers fall from the roof.

ECONOMIST: Green.view: Finger on the spot | The

Partly because of his stammer, brought on by a fall through a roof as a lad, and partly because people from Hesket didn't talk too much as a rule, he didn't care to meet strangers.

ECONOMIST: Edward Stobart