Wheat is one of the main food crops in China.

小麦是我国主要的粮食作物之一。

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Rice is one of main food crops in China, its planting area accounts for 30% in all food crops and its yield accounts for 40% in total food yield.

水稻是我国的主要粮食作物之一，其播种面积占全部粮食作物面积的30%，产量则占粮食总产量的40%。

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S. midwest. The gene crops are designed to resist herbicides and that's allowed farmers to wipe out milkweed, which is the main food source for Monarches.

基因作物可以抵抗除草剂，这样农民就可以用除草剂除掉马利筋，而马利筋是黑脉金斑蝶最主要的食物来源。

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Over the past few years, it has convened a series of meetings that brought together leading experts for each of the main food crops, such as wheat, rice, lentils and maize.

BBC: 'Climate-proof' crop hunt begins