n.保养,维修,维持,保养费,维修费
Thus they walked till they reached the foot of the upland.
他们就这样往前走,一直走到高原的山根下.
They move with their flocks to upland pastures.
他们带着牲畜迁往高原上的牧场.
It's important that these upland farms continue to survive.
这些高原农场能继续存在下去非常重要。