Sustainability is not an option, it's a responsibility.
可持续性不是选择，而是责任。
The only way to do something in depth is to work hard.
The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.
Sustainable development requires balancing economic growth with ecological protection.
用度少，则金价低贱；金价贱，则事情难成。