The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome of the historical process.
The weight of the material determines the form.
"The only limit to our realization of tomorrow is our doubts of today."
科学的进步不仅仅依赖于个人的智慧,更需要集体的合作和努力。
"I believe that every child deserves to see themselves in the books they read."