在我们生活的这个大千世界中,现存的生物有五百万至一千万种之多.达尔文曾经指出,世界上复杂纷纭的动植物,都是由原始的、简单的生物,经过亿万年的变异、遗传和自然选择而进化来的.一个品种的形成,往往需要漫长的岁月,例如从猿到人就起码经过了一千六百万年.然而近年来,由于科学家们的努力,我们有希望在较短的时间内,培育出人类所需要的各种新的品种. In the vast world we live in, there are between 5 million and 10 million kinds of living creatures. Darwin once pointed out that the world’s complex and diverse flora and fauna are made up of primitive, simple creatures that have passed through billions of years. The evolution of variation, inheritance and natural selection. The formation of a species often takes a long period of time. For example, at least 16 million years have passed from apes to humans. However, in recent years, due to the efforts of scientists, we have There is hope that in a relatively short period of time, various new species needed by humans will be cultivated.