We are the real countries, not the boundaries drawn on maps with the names of powerful men.
The value of a network is proportional to the square of the number of connected users of the system.
教育体系是以感官基础,以思考为过程,以自由为目的。
"A book is a journey you can take without leaving your chair."
可持续性不是一种选择;它是我们星球未来的必需品。
Challenges are opportunities in disguise; embrace them and grow stronger.