学习本质上是刺激-反应连接的问题。
The concept of law is a complex one, involving not only rules but also principles, policies, and standards.
I’m not a perfectionist, but I like to feel that things are done well.
The most glorious moments in your life are not the so-called days of success, but rather those days when out of dejection and despair you feel rise in you a challenge to life, and the promise of future accomplishment.