单语范例（未经PONS编辑处理）
英语
- The rock outcrop, composed mostly of rhyodacite, is a volcanic plug formed when magma welled up underneath a layer of softer rock and solidified.en.wikipedia.org
- The peak is a 439 metres high intrusive volcanic plug.en.wikipedia.org
- It is a volcanic plug of hard alkali rhyolite that squeezed up into the vents of an ancient volcano 27 million years ago.en.wikipedia.org
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英语