The theory of economic development is the study of how the economic system generates the forces which incessantly transform it.

化学的进步以新元素的发现和分析方法的改进为标志。

"The only way to get rid of temptation is to yield to it."

I stand up for what I believe in, and I don’t worry about what other people think.

I'm just a woman. And as a woman， I have no way to make money， not enough to earn a living and support my family. Even if I had my own money， which I don’t， it would belong to my husband the minute we were married. If we had children they would belong to him， not me. They would be his property. So don’t sit there and tell me that marriage isn’t an economic proposition， because it is.