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的风化壳表面，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。
It's a deep phreatic thermal explorer, or " DepthX" for short.
它是深潜水热探险者，简称" DepthX" 。
CNN 10 学生英语 2018年5/6月合集
The lava lake and the volcano's crater has been dropping for weeks now and officials are concerned that that could lead to a phreatic eruption, when steam from ground water builds up and causes an explosion.