To raise grain yield it is necessary to increase the investment in agriculture and to ensure proper scale of growing area under grain crops.

要增加粮食产量，必须增加对农业的投入，保持适度规模的粮食种植面积。

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To raise grain yield it is necessary to increase the investment in agriculture and to ensure proper scale of growing area under grain crops.

要增加粮食产量，必须增加对农业的投入，保持适度规模的粮食种植面积。

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