scarce metals

• 稀有金属

scarce metals的用法和样例：

例句

1. Some rare metals have radioactivity.
   某些稀有金属具有放射性。
2. Rare metals are extracted By our factory from scrap iron and copper oBtained By recycling the oBsolete and waste.
   本厂生产的稀有金属是收旧利废，从废铜烂铁中提炼出来的。