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. 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。
3. Other churches were conserved in previous years. 其他教堂则在前几年得以保存下来。
4. Momentum is said to be "conserved", that is, once you build it up, it has to go somewhere. 动量被认为是“守恒的”，也就是说，动量一旦被建立，就一定会转移到其他地方。
5. Within seven years of excavation, the Dover boat had been conserved and displayed, but it was apparent that there were issues that could not be resolved simply by studying the old wood. 经过长达7年的挖掘，多佛的船得到了保护和展示，但有些问题显然不能只通过研究陈旧的木材来解决。
