Wild tomatoes, for instance, are very small and round, but through selective breeding we now have cultivated tomatoes that may be pear-shaped, egg-shaped, or even donut-shaped.

• 例如，野生番茄，很小也很圆，但是我们现在选择栽培种子得时候可以选择梨形的，鸡蛋形的，或者甚至是油榨圈形状的。