概述了多金属矿山的金属特性；
合金：由一种金属跟另一种或几种金属或非金属所组成的具有金属特性的物质。
ALLOY: a substance with metallic properties composed of two or more chemical elements at least one of which is metal.
然而，诸如铝和镁之类的一些金属则具有低密度，并被用于既需要金属特性又要求重量轻的场合。
However, some metals such as aluminum or magnesium have low densities, and are used in applications that require other metallic properties but also require low weight.
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