Mr. Cox said that he flew over parts of Iowa in a helicopter last spring after a severe storm and found that deep gullies had formed in unprotected farmland, becoming conduits for soil runoff.
考克斯先生说去年春天一场暴风雨之后他坐直升机飞过爱荷华州的部分地区发现未受到保护的土地上在冲刷后已经形成了一些深沟，这些深沟成了土壤表层流失的管道。
The result shows that runoff drought index and spring wheat climate output of Hexi irrigational area appears opposite variation tendency.
研究结果表明，径流量干旱指数与河西灌溉区春小麦气候产量呈反位相的变化趋势。
The result shows that runoff drought index and spring wheat climate output of Hexi irrigational area present opposite variation tendency of phase.
研究结果表明，径流量干旱指数与河西灌溉区春小麦气候产量呈反位相的变化趋势。
So, the change tendency of runoff drought index can be used to predict the variation tendency of output of spring wheat in the future of this area.
因此，可利用径流量干旱指数的变化来预测该地区未来春小麦产量变化趋势。
So, the change tendency of runoff drought index can be used to predict the variation tendency of output of spring wheat in the fu…
因此，可利用径流量干旱指数的变化来预测该地区未来春小麦产量变化趋势。
So, the change tendency of runoff drought index can be used to predict the variation tendency of output of spring wheat in the fu…
因此，可利用径流量干旱指数的变化来预测该地区未来春小麦产量变化趋势。
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