法律义务的概念对于理解法律至关重要。
Let us unite, fight for the independence and freedom of our country.
通往可持续能源未来的道路需要一种平衡的方法，考虑经济、环境和社会因素。
A good detective knows that every answer leads to another question.
Natural selection has shaped our minds as well as our bodies.
伟大的领导力在于赋能他人实现他们认为不可能的事。