When one comes to more tractable land at lower altitudes, problems of permanent pasture improvement are not nearly so difficult.
在海拔较低的易于耕作的土地上，改进永久草场的问题并不很困难。
When one comes to more tractable land at lower altitudes, problems of permanent pasture improvement are not nearly so difficult.
在海拔较低的易于耕作的土地上，改进永久草场的问题并不很困难。
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