Can also be a period of time in the sun insolates, assuming that some have yellow, pervious to light, and there are even atomization, then this must be poor quality.

还可以在阳光下暴晒一段时间，假定有些有发黄，透光不佳，甚至有雾化，那么这一定也是质量比较差的。

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For deep and pervious soil foundation under earth-rockfill dam, a concrete diaphragm wall must be provided to control seepage.

建造在透水的深覆盖层上的土石坝，坝基常设有混凝土防渗墙，如何正确地确定防渗墙的应力是坝工设计的难点。

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