field book copper 磁场绕组
Yimen copper field 易门式铜矿
copper ore field 铜矿田
copper-strip field coil 铜条磁场线圈
the Tieshajie Copper Ore Field 铁砂街铜矿田
liushuhezi gold-copper deposit field 柳树河子金铜矿区
If someone finds a new copper field, or discovers a better way of producing wheat or steel, these increases in supply of goods confer a social benefit.
如果某人发现了一处新铜矿，或发现了更理想的方法去生产小麦或者钢铁，这些商品产量的增加会使整个社会受益。
Whenever there's a Nick or hairline crack in an insulation sheath, the electrical field in the underlying copper subtly shifts.
在绝缘套上只要出现缺口或者毛细裂缝，线缆里的铜周围的电场就会轻微改变。
The machine's electrified copper coils generate a weak magnetic field, causing the helium atoms to rotate.
机器为铜线圈充电，形成一个弱磁场，使得氦原子旋转。
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