| 释义 |
〔maar〕A flat-bottomed, roughly circular volcanic crater of explosive origin that is often filled with water.小火山口：一种底部平坦、大致呈圆形的火山爆发后形成的盛满水的低洼地〔throw〕a machine that throws tennis balls; ash that was thrown by an erupting volcano.一部发网球的机器；火山爆发喷到空中的灰〔tephra〕Solid matter that is ejected into the air by an erupting volcano.火山灰：火山爆发时喷发到空气中的固体物质〔caldera〕A large crater formed by volcanic explosion or by collapse of a volcanic cone.火山口：火山爆发而形成的环形山或大山核心部分的崩塌而形成的环形山 |