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火山的爆发是自发的。用英语怎么说？

火山的爆发是自发的。

The eruption of a volcano is spontaneous.

相关词汇
the eruption of volcano is spontaneous

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

eruption

n. 喷发，爆发；

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

volcano

n. 火山；

is

vt.& vi. 是（be的三单形式；n. 存在；

spontaneous

adj. 自发的，自然的，天然产生的，无意识的；
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