Waterlogged soils occur in areas that are flat or have poor drainage.
涝渍土壤发生在地势平坦或排水不畅的地区。
In recent years, poor drainage systems and a rise in the number of extreme weather incidents have resulted in many cities experiencing heavy rain and flooding.
近年来，由于落后的排水系统和日益增加的极端天气，已经导致许多城市经历了暴雨和洪涝灾害。
The main factors are reinforcing dike with silt, construction in high speed, soak deformation, poor drainage, stacking load at the tip of dike, impact of vehicle and so on.
大堤开裂的主要原因为背河侧放淤、淤背施工过快、湿化变形、排水不畅、堤顶堆载、车辆作用等。
Some soils, such as sandy soils, have a loose crumb structure with good drainage, whereas in clay soils the particles are small and stick together to give a dense crumb structure and poor drainage.
一些土壤例如砂土具有松散的结构，因而有良好的排水性，而在粘土中，由于土壤颗粒小而互相粘合导致粘土结构紧密排水性较差。
[disadvantages] : in case of poor drainage, easy to soak water, installation and maintenance inconvenience, equipment dependence, poor ventilation at the bottom, easy to damp electronic components.
【缺点】：如遇排水不畅，容易积水浸泡，安装和维修不便，设备依赖性强，底部通风不良，电子部件易受潮。
Recently a spate of sinkholes in Viet Nam, poor drainage of rivers in upland Thailand, and a sinkhole in the Philippines have drawn a remarkable line across the Sunda Plate.
最近越南一系列的地陷，泰国高地的河流排水不良，和菲律宾的一个地陷描绘出了一条贯穿巽他板块的特别的线。
Poor drainage causes deficient soil aeration and death of the roots.
排水不良能减低土壤的透气性，使根死亡。
Poor drainage causes deficient soil aeration and death of the roots.
排水不良能减低土壤的透气性，使根死亡。
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