太阳每天向地球倾泻成万倍于人类活动所需的能量，人们需要解决如何廉价地开发太阳能的问题。而自然界则不存在这个问题。“太阳能电池”就长在树上，绿叶的光合作用把太阳光转化为化学能，几乎为一切自然生态系统提供着能源。的确，人们可以从植物得到启迪：如何充分利用太阳 The sun is pouring thousands of times a day into the earth’s energy needed for human activities and people need to address the issue of how to develop solar energy cheaply. And nature does not have this problem. Solar cells grow on trees, and the photosynthesis of green leaves converts sunlight into chemical energy that provides energy to almost all natural ecosystems. Indeed, one can get inspiration from plants: how to make the most of the sun