技术应该为农民服务，而不是让他们的工作复杂化。

The Liskov Substitution Principle is a fundamental concept in object-oriented programming, ensuring that derived classes can be used in place of their base classes without altering the correctness of the program.

The idea that a bell rings to signal when investors should get into or out of the stock market is simply not credible.

最大的财富是知足常乐。