“heavy rare earth”造句，怎么用heavy rare earth造句

The co precipitation behavior and the effects of impurity ions on the crystallization properties of yttrium base heavy rare earth carbonate were investigated.

Rare earth consists of two categories: one is heavy rare earth, the other one is light rare earth.

Half the heavy rare earth mines have licenses and the other half are illegal, industry executives said.

A new type of Y-base heavy rare earth modificator was developed.

There are two kinds of rare earth metals, the heavy rare earth elements and the light rare earth elements.