“rare earth”可以造什么句，rare earth造句

The synthesis methods of nipagin esters catalyzed by sulfuric acid, p- toluene sulfonic acid, ferric sul-fate hydrate, ferric chloride hexahydrate, aluminium chloride hexahydrate, rare earth compound, solid super acid and heteropoly acid were reviewed.

The countryside around Xinfeng is dotted with hundreds of small open-pit mines into which miners pour water and chemicals, producing a sludge rich in rare earths.

Mr. Song said he was perplexed why people far from China were so eager for the golden flecks of rare earths that dot the clay of his formerly pristine valley.

Exports of rare earths were subject to an unannounced weeklong ban (see article).

During 1980s and 1990s, China lacks management over rare earth, nor does China has the technology to excavate rare earth.

An unfolding collision around a group of elements known as "rare earths" is seen by some as a test of China's willingness to reciprocate.