Latin America comes out of the exercise relatively well: the yields of its main crops are expected to fall by only a few percent.

拉美的预演结果相对不错：主要作物产量只会降低几个百分点。

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Winter wheat is the most important food crop in North China Plain, normally, it sown along with barely in early fall after the harvesting of summer crops such as broomcorn and soybeans.

冬小麦是华北平原最重要的粮食作物，通常是和大麦一起，在秋初继收成夏季作物如高粱、大豆之后播种的。

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In an EPA meeting on GM crops last fall, Vaituzis acknowledged the lack of long-term data on Bt crops and insect populations.

2000年秋天，在环保署的一个基因改造作物会议中，卫图吉斯承认他们缺乏Bt作物和昆虫族群的长期研究资料。

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There is even some concern that the revenge of the weeds will cause agricultural yields to fall for some crops.

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