native copper ore造句

例句与造句

1. Often, the nature of the gangue is important, as clay-rich native copper ores prove difficult to liberate.
2. When rich enough, native copper ore bodies may be treated to recover the contained copper via a gravity separation circuit where the density of the metal is used to liberate it from the lighter silicate minerals.
3. It's difficult to find native copper ore in a sentence. 用native copper ore造句挺难的