The elegance of a mathematical proof is in its simplicity and clarity.
Kindness is the most beautiful language.
全球金融危机是现代历史上最严重的危机,需要采取非同寻常的应对措施。
The only limit to our realization of tomorrow is our doubts of today.
黄芩(唾手可得)没有造假,阿魏(稀有昂贵)容易造假。