主要的义务规则是那些要求或禁止某些行为的规则。
The primary rules of obligation are those that require or forbid certain actions.
The future of fishing lies in balancing economic growth with ecological responsibility.
The biggest risk is not taking any risk.
The market is always changing, the only constant is change itself.
The ethical implications of genetic modification must be carefully considered.
最终，爱才是最重要的。
唯一能给你带来幸福的是你自己。
