In the processing of sandstone sample for glass, tool iron which is prevented and removed is a quite important problem which concerns the assessment of ore deposits.
在玻璃用砂岩的样品加工中，防止和除去工具铁是一个关系到矿床评价的重要问题。
Once you do that, you can compare the age of the Zircon in the sandstone in your sample to the age of the Zircon in the mountains.
一旦你这样做了，你就可以比较样品中砂岩里锆石的年龄和山上锆石的年龄。
Once you do that, you can compare the age of the Zircon in the sandstone in your sample to the age of the Zircon in the mountains.
一旦你这样做了，你就可以比较样品中砂岩里锆石的年龄和山上锆石的年龄。
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