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Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.

珍珠、黑耀质熔性为主,中基性者也常见。

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commis, commiserable, commiserate, commiseratingly, commiseration, commiserative, commision, commissar, commissarial, commissariat,

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3G, 401(K), a,

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十万个为什么

Found in modern day Turkey, these primitive mirrors were made out of a polished volcanic glass called obsidian.

在现代土耳其发现,这些原始镜子是由一种叫做黑曜石火山玻制成

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Also, in terms of ancient stone tools, they're gonna use things like obsidian, it's volcanic glass.

此外,就古代石器而言,他们会使用黑曜石,这是火山玻

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VOA Special 2017年11月合集

The villagers harvested wheat, raised animals and used simple tools made of bone and volcanic glass.

村民们收割小麦,饲养动物,并使用由骨头和火山玻制成简单工具。

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commissionership, commissioning, commissura, commissurae, commissural, commissure, commissuroplasty, commissurotomy, commit, commit oneself,

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3G, 401(K), a,
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