Install a flush toilet with small pondage.

安装一个贮量小的抽马桶。

This research discovered that soil pondage of level terrace were less than fallow sloping filed because of crops’ absorbing and using, and evaporation.

发现由于梯土的吸收利用，以及蒸发散的原因，导致平梯的土贮量比休闲坡地小。