Copper wires are carried back from the rotating terminals to the individual sliprings along grooves in the outside of the shaft . 铜导线从旋转凸块沿着轴外部的凹糟引回到各个滑环上去。
It is not possible to make this light alloy by melting the small part of copper and then adding the much larger part of aluminium . 在炼这种轻质合金时，就不能先熔小部分的铜，再加进大部分铝。
Ore minerals in the colorado-type deposits are of uraninite and coffinite, with associated vanadium and copper minerals . 科罗拉多型矿床中的铀矿物为晶质铀矿和水硅铀矿，与之共生的还有钒，铜矿物。
Copper was reduced from 20 mg/l to below detectable limits by sulfide precipitation from a gold-ore extraction wastewater . 用硫化物沉淀法可将金矿抽提废水中的铜含量从20毫克升降到可检测标准以下。
The copper pitcher of hot water in the basin, the sliver of his brushes, and the line of his well-polished boots, all shone . 面盆里的黄铜热水壶，银色的刷子，擦得亮晶晶的皮靴的线条，全都闪熠发光。
They analyzed their samples for lead, sodium, copper and found that some of the ratios were close to the values found for the earth's crust . 他们分析了样品中铅、钠、铜，发现某些比率接近于地球外壳中的值。
Methylmercury was extracted from the homogenized tissue with toluene in the presence of copper sulfate, sodium bromide and sulfuric acid . 在存在硫酸铜、溴化钠和硫酸的情况下，用甲基从组织匀浆中萃取甲基汞。
Man had known for several millennia how to mix copper and tin to make bronze-but why, why does this work so well ? 几千年来，人们已经知道了怎么样混合铜和锡来制造青铜--然而，为什么，为什么这种混合效果这么好呢？
