The torrential rain may flood the low-lying land out.

这场骤雨有可能把低洼地淹没。

The cottage is in that hollow.

村舍在那片洼地。

Hypergenesis palaeokarst usually manifests distinct vertical zoning rule which divides into epikarst zone, vadose zone and phreatic zone.

表层岩溶带位于风化壳表层上部，风化淋滤及地表径流改造而破碎，短距离搬运堆积于地势相对较低洼风化壳表面，形成一些溶沟、溶洞、溶缝、溶蚀洼地、溶蚀漏斗及落水洞等，其充填物主要为地表残积物和洞壁塌积物。

The karst depression belongs to the accumulative area of surface water and subdrainage area of subsurface water, the karstification is relatively week, and reservoirs are undeveloped.

岩溶斜坡和岩溶洼地为地表水汇集及地下水，岩溶作用相对较弱，储层不发育。