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。
Some peaks and ridges face each other and form deep cliffs and gullies.
有的峰岭夹峙峡谷自然形成了陡壁深壑。
Some peaks and ridges face each other and form deep cliffs and gullies.
有的峰岭夹峙峡谷自然形成了陡壁深壑。
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