解释：看见外表就可以知道内里，看见过去就可以知道未来。

数学的力量在于它的普遍性和抽象性。

The material has its own intelligence.

"To live is to choose, but to choose well, you must know who you are and what you stand for."

Leadership is about making tough decisions with vision and integrity.

每一本书都是一次旅程，每一页都是向未知迈进的一步。