Today's improved pig, for example, is accustomed to eating a mixture of Western feeds such as maize and beans. If an emergency like a war or an oil crisis ever broke out and feed factories had to shut down, the improved breeds would find it hard to survive.
像現在的改良種豬，吃慣玉米、大豆等合成的「西餐」，一但發生緊急狀況，例如戰爭、石油危機，飼料工廠停擺，改良種就難以活命。