Since the 17th century, field drainage has been one of the prerequisites of efficientagriculture.
自17世纪以来，农田排水设施一直是高效农业的先决条件之一。
2
This trend can be reversed by implementing long-term national strategies to restore efficient subsistence agriculture.
通过实施长期国家战略，恢复有效地自给自足的基础农业，可以扭转这个趋势。
3
Employment rates increased: More efficient crop production on terraces and the diversification of agriculture and livestock production have brought about new on-farm and off-farm employment.