Install a flush toilet with small pondage.

安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.

发现由于作物对土壤分的吸收利用，以及蒸发散的原因，导致的土壤贮量比休闲坡地小。