Sandy soil, on the other hand, has excellent drainage, but sand can drain too well.
砂土另一方面，具有良好的排水系统，但可以漏沙太清楚。
Ventilation modeling goes hand in hand with gas drainage strategies.
通风系统建模与瓦斯抽放系统相互相成。
In the mine regions, flood is existed by mining on the one hand, and on the other hand water for daily use is short because of drainage and dewatering.
矿山地区一方面采矿存在着水患，另一方面又因疏干排水而使日常生活缺水。
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