劳动是一切财富和一切文化的源泉。
Labor is the source of all wealth and all culture.
Never let your sense of morals prevent you from doing what is right.
衡量一个人的真正标准是他如何对待那些对他绝对没有好处的人。
"A literatura não tem fronteiras, ela transcende culturas e línguas."
The concept of NP-completeness has provided a powerful tool for understanding the complexity of problems.