In algebra, the equality of two quantities is expressed by an equation.
在代数中,两个量的相等性通过方程来表达。
Success is not about the money you make, it's about the difference you make in people's lives.
心理学的真理存在于实践经验中。
规律存在于物质之中,物质无不体现规律;物质存在于虚空之中,虚空无不包含物质。