In quantum mechanics, the observer is not objective but is part of the system.
在量子力学中，观察者不是客观的，而是系统的一部分。
The Liskov Substitution Principle is a fundamental concept in object-oriented programming, stating that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.
"A good book is a door to another world."
交易中最重要的是保护你的资本。
地震是一种自然现象，而不是一种惩罚。