Previous research in this area has shown that, in general, above-ground drainage systems benefit from a reduction in pipe diameter to improve drain self-cleansing.
该领域过去的研究表明，一般说来，地面以上的排水系统能通过减小管道直径而受益，从而改进排水的自清理。
Endogenous rivers often do not reach the sea but drain into inland basins, where the water evaporates or is lost in the ground.
内源河流通常不会流入大海，而是流入内陆盆地；在那里，水会蒸发或流失到地下。
D-M method is a new ground treatment tool which combines long plastic drain with short cement mixing method.
结合目前地基处理方法的优缺点，提出搅拌桩和塑料排水板联合处理的方法，即长板短桩工法。
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