So they have exchanged their tea bushes for a healthy new purple tea that they hope will sell for a higher price.

所以他们将茶树改成一种新型健康的紫茶，希望能卖个好价钱。

Because scientists have developed a genetically modified purple tomato; they took red tomato plants and changed their genetic patterns so that they now produce new, purple tomatoes.

他们把红色番茄的基因模式进行了更改，因此才生产出了新品种的、紫色的番茄。

If every mating results in two new purple people-eaters, then in the next generation, each male's genes are carried on by 18 offspring, but each female–on average–gets their genes into just 2.

如果每一次配偶的结果是产生两个宝宝，那么在他们的下一代一个雄性的基因将会出现在 18 个幼崽的体内，但是平均下来每个雌性的基因只能出现在两只幼崽体内。