对地球最大的威胁是认为别人会拯救它的想法。
For life to be a fairytale, perhaps all you need is to believe.
The deepest problems in mathematics often arise from the simplest questions.
数学证明的优雅常常反映了它所描述的算法的效率。
好的政策需要健全的理论和实证验证。
In a rapidly changing market, flexibility is the key to success.