upland field的用法和樣例：
例句
- It was difficult for upland crops to grow on the saline-alkali soil in the coastal plain and Liaohe river regions.
在沿海平原和遼河流域鹽鹼土上很難種植旱地作物。 - It becomes obvious that nutrient inputs significantly influence the rates of economic return in upland cropping systems.
顯而易見，養分投入顯著影響旱地種植制度下的經濟收入。
