The concept of legal validity is crucial for understanding the nature of law.
法律效力的概念对于理解法律的本质至关重要。
"A child who reads will be an adult who thinks."
乳制品生产的可持续性不是一种选择，而是对后代子孙的必要责任。
The next generation of farmers will be the most technologically savvy in history.
The best leaders are those who create more leaders, not more followers.
The past is a foreign country; they do things differently there.
The key to security is not to trust anyone, including yourself.