This paper analyzes detailed the causation of the vacuole, irregular crack, sand out, surface pit, and brings up treatment and prevention measure.

本文对水泥地面经常出现的空鼓、不规则裂缝、起砂和麻面等问题原因进行了详细分析，并提出了处理与预防措施。

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CAD is employed in the designing of pit heat-treatment furnace, containing a established data bank of furnace body, optimum seeking of furnace lining materials and automatic drawing-making.

采用微机辅助设计热处理井式加热炉，建立一套护体设计的数据库，优选了炉衬材料，自动绘制炉体结构图。

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Experiments show that a surface treatment process forming a protective coating prevents the pit-formation and extends the service lives in se veral folds.

试验已经充分证明：气阀上采用一种表面处理方法所得到的涂层可以有效地减少并推迟“麻坑”的产生，数倍地提高了使用寿命。

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But Teessider Tomlinson had to be taken from the long jump pit for medical treatment to his ankle following that attempt, with England team doctors set to decide on Saturday whether he is fit to compete in the final later that day.

BBC: Commonwealth Games 2010: Turner eases to hurdles title