单语范例（未经PONS编辑处理）
英语
- This rock is typically of extrusive origin, formed by compaction of fine volcanic ash, and may be found in association with obsidian and rhyolite.en.wikipedia.org
- It used to be found in fissure veins in the extrusive igneous rhyolite rock.en.wikipedia.org
- The texture is often found in extrusive aphanitic, or glassy, igneous rock.en.wikipedia.org
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英语