自守形式的研究不仅是一个技术课题，也是一个哲学课题。
目标不是永远活着，而是创造一些能够永存的东西。
What you actually pay for something is at least twice the listed price because of the energy， time， money needed to set it up， learn， maintain， repair， and dispose of at the end. Not all prices appear on labels. Actual costs are 2x listed prices.