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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But beneath that placid surface the IMF sees a snake pit of threats.

但在风平浪静的表面下，IMF看到了一蛇窝的威胁。

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Once you have made the Dakota fire hole you can easily set up a cooking surface for pots and pans by laying several parallel green sticks across the fire pit as show in the picture.

一旦火坑挖好，你可以在达科他火坑的基础上做很多改进，比如在火坑上方用绿枝搭建烤架，也可以坑边上堆一些石块，做成可以放锅的简易炉灶。

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At one fetid pit in a jungle glade, he stepped gingerly onto the surface of the pool, where the solid matter in the produced water had congealed into a tarlike crust that was sturdy enough to support him.

NEWYORKER: Reversal of Fortune