They'd mined the hillside for the ores.他们曾在这个小山坡上开采矿石.After enduring the hardship of the arduous fieldwork , the prospecting team discovered many new ores.地质勘探队员餐风饮露,历尽辛苦, 找到了不少新的矿藏.This is not always true - as with...
Microscopically the ores are medium grained to amorphous.显微镜下,矿石为中粒至非晶质.Iron ores of greatest economic interest contain magnetite and hematite.最具有经济价值的铁矿包括磁铁矿和赤铁矿.Ores are also being obtained in quantity from other count...