scarce metal

• 稀有金属

scarce metal的用法和样例：

例句

1. Rare metal is indispensable for the aircraft industry.
   稀有金属是航空工业发展不可或缺的原材料。
2. These coins were round lumps of precious metal with their weight stamped on them.
   这些硬币是由稀有金属制成的圆形块状物，上面印有其重量。