这些火山灰中含有锆石等矿物，这些矿物中的某些组分允许进行精确的放射性测年(以确定精确的年代数据)。

The ash contains minerals such as zircon that can be dated precisely from the radioactive decay of some of their components.

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本文应用灰系统理论中的关联分析方法，初步探讨了麦谷蛋白各组分含量与面包烘烤品质指标间的关系。

A preliminary probe has been made into the relationship between components contents of glutenin and baking quality targets of bread by related analysis in this paper.

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但类似的易熔组分和添加草木灰又成为配制原始瓷铀的配方，从而过渡到原始瓷器的发明的一个重要因素。

But some similar recipe of fusible clay-plant ash mixture also played an important role in the invention of porcelain glaze in shang dynasty.

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