在这种情况下，骨骼或外壳的原始成分会保留下来，但化石会变得更坚硬、更耐用。
In such cases, the original composition of the bone or shell remains, but the fossil is made harder and more durable.
而意味着“自然的原始成分不容易被人们介入操纵”，菲尔普斯先生这么写道。
Nor, Mr Phelps has written, does it mean "a pristine element of nature not susceptible to intervention by man."
人们发现，在一些保存着太阳系原始化学成分的陨石中，铱元素的含量很高。
Ir is found in high concentrations in some meteorites, in which the solar system's original chemical composition is preserved.
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