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| 1. | The islands being wholly of volcanic origin, the soil is necessarily very rich. |
| 岛上全是火山地带，土质自然非常肥沃。 |
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| 2. | basin of volcanic origin |
| 火山盆地 |
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| 3. | more than 800 islands in the southwestern Pacific; larger islands (Viti Levu and Vanua Levu) are of volcanic |
| 太平洋西南地一群待改超过个岛屿组成的群岛；由于火山而形成，由珊瑚礁包围；较小的岛屿是珊瑚。 |
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| 4. | Composed chiefly of rock fragments of volcanic origin. |
| 火或碎屑物的由火山造成的碎石所组成的 |
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| 5. | Present evidence points to a volcanic origin far in the past for the majorty of the craters. |
| 最近的资料表明，现在比过去更倾向于火山是大多数环形山的起因。 |
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| 6. | Of volcanic origin. |
| 火山生成的 |
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| 7. | 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 |
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