Selectively breeding a wild plant or animal species for certain desirable traits began as a fitful process of trial and error motivated by that age-old imperative: hunger.
Clearly, if meat, milk and eggs were on trial for crimes against the environment, the prosecution would have an easy ride. And that says nothing of animal-welfare issues.
如果列数肉类、牛奶、蛋类对环境的污染“罪行”，这证据是显而易见的，且与动物本身附加值无关。
3
Getting good results in a large animal model study is a critical step in moving the treatment into a clinical trial.