数学中最重要的是理解概念，而不仅仅是记忆公式。
The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.
"The moment you doubt whether you can fly, you cease for ever to be able to do it."
解释：皮都不存在了，毛还在哪依附呢？
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 best films are the ones that make you feel something.
