Lead, iron, copper, tin, and zinc are base metals.
铅、铁、铜、锡和锌都是基本金属。
Ferrous alloys are those in which the base or primacy metal is iron...
含铁类合金中的基本或主要金属是铁质。
Base:transparent round or square glass base ; Or Iron base plated .
底座：玻璃底座或金属镀铬底座，但是报价不含底座。
Iron and steel are base metals but gold and silver are precious metals.
钢铁是贱金属而金银则是贵金属。
Iron and brass are base metals.
铁和黄铜为非贵重金属。
Iron and brass are base metals.
铁和黄铜为非贵重金属。
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