为了某些可取的特性，人类选择性地繁育野生植物或动物物种，这一开始是一个断断续续的反复试验过程，驱动它的是由来已久的紧迫之事——饥饿。
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.
一个重大的障碍就是种茶和种咖啡分别在锡兰和马来西亚获得了成功，这使得种植园主没有理由来试种一种没有试过的物种。
One major obstacle was the success of tea (Ceylon) and coffee (Malaya) gave planters no reason to try an untested crop.
一个重大的障碍就是种茶和种咖啡分别在锡兰和马来西亚获得了成功，这使得种植园主没有理由来试种一种没有试过的物种。
One major obstacle was the success of tea (Ceylon) and coffee (Malaya) gave planters no reason to try an untested crop.
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