upgraded ore的用法和样例：
例句
- The concentrate from a Yunan high sulfur iron ore has a sulfur content that exceeds that specified in the standard due to the pyrrhotite.
云南某高硫铁矿石因含磁黄铁矿而造成精矿含硫超标。 - Experiment on determination of trace Argentum in copper coneentrace ore was done.Method of inhibition of Copper to determine Argentum was studied.
对湖南省麻阳铜矿铜精矿中的微量银作了原子吸收光谱法制定试验，研究了铜对银的测定的干扰，并提出了消除干扰的方法。
