儿童书籍应该像阅读它们的孩子们一样多样化。
Stay true to yourself, yet always be open to learn.
千丈长的大堤,会因为蝼蚁的小洞而溃决
As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.
在数学中,就像在生活中一样,最深刻的发现往往来自于提出最简单的问题。