在动物培育方面，这种瓶颈已然显现：火鸡已经肥胖到无法行走的地步，鸡禽生长速度过快，导致应力性骨折的发生。
In animals biological limits are already clear: turkeys are so bloated that they can no longer walk; chickens grow so quickly that they suffer stress fractures.
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。
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.
其中包括培育和收获我们所食用的全部植物、动物和动物产品，以及将食品加工、包装和运输到世界各地的市场。
That includes raising and harvesting all the plants, animals, and animal products we eat, as well as processing, packaging, and shipping food to markets all over the world.
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