有道德的人能够反思自己过去的行为及其动机。
A moral being is one who is capable of reflecting on his past actions and their motives.
Sustainability must be at the core of every stone we extract, or we extract nothing at all.
La ficción es más real que la realidad, porque la ficción nos permite ver lo que la realidad oculta.
Modern quarrying must marry the wisdom of geology with the innovation of engineering.
自然是用数学语言写的。