sedimentation of ground 基本例句 地面沉降 Subsidence may be the critical factor in managing a ground water reservoir.地面沉降在管理地下水盆地的工作中可以算是一个关键性因素。 Historical actuality of ground settlement is explained Using changes of benchmark height data.以水准点高程数据变化说明地面沉降历史现状。