rare materials meaning in Chinese

稀有文献资料

These tools and weapons reflect power relations through their appropriation of advanced techniques and rare materials
这些器具通过占有最高超的技术和珍贵的材料，体现出权力的力量。
That rare material , sometimes seen in meteorites that have roamed the inner solar system , had never before been detected in a comet
有时可以在内层太阳系遨游的陨星中发现这些稀有的物质，而此前从未在彗星中发现过它们。