1. All existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands. 现有的所有氦供给应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途优先于其他商业或娱乐需求。
2. Before the rules of diplomatic precedence were worked out in the early sixteenth century, rival ambassadors often fought for the most honourable seating position at a ceremony. 在16世纪早期外交优先规则制定之前，敌对的大使经常在仪式上争夺最尊贵的座位。
3. Firstly, all existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands. 首先，所有现有的氦供应应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途应优先于其他商业或娱乐需求。
4. She had to learn that her wishes did not take precedence over other people's needs. 她必须懂得，自己的愿望不能先于别人的需要。
5. Have as much fun as possible at college, but don't let it take precedence over work. 在大学里尽情地玩，但别让玩乐优先于学习。
