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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、和松脂等玻质熔以酸性，基性者也常见。

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at once, at one stroke, at one time, at present, at random, at regular intervals, at school, at sea, at six, at stake,

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3G, 401(K), a,

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原声例句
连线杂志

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，是火山玻璃。

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十万个为什

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

代的耳其，些原始的镜子是由一种叫做黑曜石的抛光火山玻璃制成的。

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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璃制成的简单工具。

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at the front of, at the head of, at the instance of, at the last moment, at the latest, at the least, at the mercy of, at the moment, at the most, at the opposite extreme,

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3G, 401(K), a,
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