Second, yield growth has been lower in wheat and rice than in corn and soyabeans.

其次，小麦和水稻的产量增长一直低于玉米和大豆。

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This is problematic because wheat and rice are more important as foods, accounting for around half of all calories consumed.

这是有问题的，因为小麦和大米作为食物时更为重要，约占卡路里消耗总量的一半。

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The world's population is expected to reach 7,000 million by the year 2000, but already scientists have produced new and better varieties of wheat and rice and animal.

到2000年，世界人口预计将达到70亿，但是科学家已经培育出了新的、更好的小麦、水稻和动物品种。

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Borlaug worked in fields to show farmers new ways to grow crops like wheat and rice.

VOA: special.2009.11.10

In certain location things were dominated by certain cereals; rice in Asia, wheat in Europe, sorghum and millet in Africa, and maize in the New World.

不同的地方有不同的主食,比如,亚洲主食米饭,欧洲主食小麦,非洲主食高粱和小米,美洲主食玉米

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

He worked in the fields to show farmers new ways to grow wheat, rice and other crops.

VOA: special.2009.09.22

Global production of corn, wheat and rice have all more than doubled since 1970 as global warming occurred.

FORBES: Fortified By Global Warming, Crop Production Keeps Breaking Records

And after two bumper years, the government says it has enough wheat and rice in store to prevent serious food-grain price inflation.

ECONOMIST: India's water crisis

The government also pays inflated prices for most wheat and rice, then sells much of it back to villagers as cheap rations.

ECONOMIST: Cities