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关注：1
2013-05-23 12:21
求翻译：Watersheds in the upper Midwest Corn Belt are flat and extensively tile-drained, producing high yields of corn and soybeans, but also large losses of nitrate. These watersheds are the focus of many govern-ment programs to reduce tile nitrate losses, but there has been little success so far是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
Watersheds in the upper Midwest Corn Belt are flat and extensively tile-drained, producing high yields of corn and soybeans, but also large losses of nitrate. These watersheds are the focus of many govern-ment programs to reduce tile nitrate losses, but there has been little success so far
问题补充： |
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2013-05-23 12:21:38
在中西部玉米带流域是平的，广泛的瓦片排水，生产玉米和大豆的产量高，而且硝酸盐的巨大损失。
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2013-05-23 12:23:18
在集水区的上部中西部玉米带平整、广泛互动程序的排放、生产产量高的玉米和大豆,但也很大损失的硝酸盐。 这些流域的重点是许多政府方案,以减少互动程序硝酸盐损失,但没有成功,因此到目前为止
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2013-05-23 12:24:58
意义重大在上部中西部玉米主要产区是平和瓦片广泛地排泄，生产高出产量玉米和大豆，而且硝酸盐大损失。 这些意义重大是减少瓦片硝酸盐损失的许多政府项目焦点，但有一点成功到目前为止
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2013-05-23 12:26:38
Watersheds in the upper Midwest Corn Belt are flat and extensively tile-drained, producing high yields of corn and soybeans, but also large losses of nitrate.These watersheds are the focus of many govern-ment programs to reduce tile nitrate losses, but there has been little success so far
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2013-05-23 12:28:18
在上面中西部玉米地带的分水岭是平的和广泛玉米和大豆的瓦片排出，生产高产量，而且硝酸盐的大损失。这些分水岭是很多政府程序的焦点减少瓦片硝酸盐损失，但是没迄今为止有过成功
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