冶金工程师研究和开发新的合金和从矿石中提取金属的系统；

Metallurgical engineers research and develop new alloys and systems for extracting metal from ores;

youdao

冶金工程师研究和开发新的合金和从矿石中提取金属的系统；

Metallurgical engineers research and develop new alloys and systems for extracting metal from ores;

youdao