万物生长靠太阳。除此之外,人们还希望用这取之不尽、用之不竭的自然恩赐来减缓一次性化石能源日渐枯竭的脚步并减轻因使用一次性化石能源而造成的对环境污染的压力。显然,这是好事。但,好事多磨。虽然,在人类的主要居住区,太阳总是慷慨地把自己的阳光平等而充盈地分给人们,但这并不意味着人类利用阳光可以唾手而得,相反, Everything grows by the sun. In addition, people also hope to use this inexhaustible natural gift to slow down the depletion of disposable fossil fuels and reduce the environmental pollution caused by the use of disposable fossil energy sources. Obviously, this is a good thing. But, good things get more. Although, in the main human settlements, the sun always generously distributes its sunshine equally and abundantly to people, this does not mean that mankind can easily find use of the sun. On the contrary,