Introspection is the only method by which the mind can be directly observed.
Sustainability is the future of quarrying, and we must act now.
如果我等待完美,我将永远写不出一个字。
永远要走“正道”,它并不拥挤。
教育是可持续林业的基础,人们保护他们所理解的事物。
It is because nations tend to stupidity and baseness that democracy is possible.