Tephra is any fragmented material produced by a volcanic eruption, be it ash or rock.
无论是灰烬还是岩石，所有因火山爆发而形成的碎片状物质都称作火山灰。
That other boulder, which must have been close to Lookout Rock and of similar size, had been fragmented to make this path and terrace, losing its identity.
眺望岩附近其他大小相近的巨石都被凿碎来铺这条小路和这块阶地，因而也失去了本来面目。
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