Install a flush toilet with small pondage.

安装一个贮水量小的抽水马。

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

由于作物对梯土壤水分的吸，以及蒸散的原因，导致水平梯的土壤贮水量比休闲坡地小。