| 释义 |
〔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〔ridge〕A long narrow chain of hills or mountains. Also called ridgeline 山脊，山脉：丘陵或大山的狭长山脉 也作 ridgeline〔hill〕A well-defined natural elevation smaller than a mountain.小山，山冈：陆地上局部的天然高地，有明显轮廓，略小于大山 |