柯林斯词典base metal (base metals) 1. N-VAR A base metal is a metal such as copper, zinc, tin, or lead that is not a precious metal. 普通金属 返回 base metal剑桥词典a common metal , such as lead , tin , or copper , that reacts easily with other chemicals and is not a precious metal 贱金属（如铅、锡、铜） 返回 base metal