但如果铅以单元素形式构成物质而不与其它元素结合，便可称此种矿物为自然铅。

But when lead is found alone and not combined with another element, it is referred to as native lead.

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方铅矿和自然铅，虽然一种是由化合物构成，另一种是由单元素构成，但它们二者都是矿物。

One is a compound, the other an element, yet both galena and native lead are minerals.

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锇：是一种密度大的自然元素——其密度是铅的两倍——这种蓝灰色的金属在需要硬度和稳定性的应用领域大放异彩。

Osmium (Os) : The densest of natural elements-twice as dense as lead-this blue-grey metal finds a home in applications where hardness and durability are essential.

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