In nature, every organism produces thousands of enzymes, each of which catalyzes a specific biochemical reaction, such as cleaving a particular molecule in a set place or fusing two substances.

• 自然界里每种生物都可生成数千种酵素，各自催化了特定的生化反应，好比说在一定环境下将某个分子切成两半，或是把两种物质合而为一。