Please not it does not have to be a shell.

请没有它不应该是一个空壳。

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Replacement can be a marvelously precise process, so that details of shell ornamentation, tree rings in wood, and delicate structures in bone are accurately preserved.

替换可能是一个令人惊叹的精确过程，因此贝壳纹饰的细节，树木的年轮和骨的微妙结构都被准确地保存。

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The empty shell of a snail or clam may be left behind, and if it is sufficiently durable and resistant to dissolution, it may remain basically unchanged for a long period of time.

蜗牛或蛤蜊的空壳可能会被留下来，如果足够持久和抗溶解，它可能会在很长一段时间内基本保持不变。

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So if we actually go ahead and multiply it by the volume of our shell, then we end up just with probability, which is kind of a nicer term to be thinking about here.

乘以壳层的体积,我们就得到了概率，在这里从这个角度，理解问题更好一些,如果我们考虑的是。

麻省理工公开课 - 化学原理课程节选

They would still be on Ecofin, but Ecofin would be a shell.

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The subway gassing also showed Japan to be a shell of its legendary self as a country where nothing goes wrong, a humbling exacerbated by a stubborn recession and the haphazard relief during the Kobe quake in January.

CNN: Newsmakers 1995

The wave of star birth will continue to migrate farther out in the nebula, he said, until in a few million years it will be a shell of glowing gas with its most massive stars at its periphery.

CNN: Stellar nursery in nearby galaxy teems with activity