The world is full of doors, and every door is a choice.
人类的历史发展表明,最多样化的种族对我们现在所拥有的文明做出了贡献。
The beauty of mathematics only shows itself to more patient followers.
The only thing more dangerous than ignorance is arrogance.
农民是我们粮食系统的支柱,他们的知识和奉献必须得到重视。