道的真谛自有其恒常的规律，人若不能明白，必然会反复仰慕追求。

The opening up of new markets, foreign or domestic, and the organizational development from the craft shop and factory to such concerns as U.S. Steel illustrate the same process of industrial mutation—if I may use that biological term—that incessantly revolutionizes the economic structure from within, incessantly destroying the old one, incessantly creating a new one.

人们对自己的遗传学了解得越多，就越能掌控自己的健康。