没有内容的思想是空洞的,没有概念的直觉是盲目的。
在代数中,两个量的相等性通过方程来表达。
Innovation is not just about creating something new; it's about solving real problems in ways that matter.
Man is defined as a human being and a woman as a female — whenever she behaves as a human being she is said to imitate the male.