The most problematic materials may be rare-earth metals such as neodymium used in turbine gearboxes.

真正棘手的原料是稀土金属，比如用在涡轮机变速箱中的钕。

youdao

Besides the microdots, each batch also contains a unique combination of up to 30 compounds of rare-earth metals.

除了小微粒，每批粘着剂都包含着特异的多达30种稀土的金属复合物。

youdao

Other types of magnets could be used in turbines, and rare earth metals could be recycled.

其他种类的磁铁可以用在涡轮机上，稀土金属可以循环使用。

youdao

Also present in the region are lithium, vanadium, and rare-earth metals, not to mention a potential for uranium and diamonds.

FORBES: Plan Nord's Extension of Route 167 Key for Mining in Northern Quebec: Stornoway CEO

Asteroids could yield precious minerals such as gold, platinum and rare-Earth metals.

BBC: New venture 'to mine asteroids'

Japanese Prime Minister Kan said Sunday, after meeting with his Vietnamese counterpart, Nguyen Tan Dung, in Hanoi, that Vietnam chose Japan as a partner to mine rare-earth metals and to develop nuclear power in the Communist country, the Associated Press reported.

WSJ: Clinton Presses China to Do More to Restrain North Korea