活火山爆发是一种可怕的自然现象。
新图片显示厄瓜多尔首都基多附近一座活火山爆发，岩浆四溢，流向山下。
New pictures are showing how active a volcano near Ecuador's capital of Quito is gotten.
它有高密度的活火山与高频率的火山爆发活动。
It has a high density of active volcanoes, and a high frequency of volcanic eruptions.
它有高密度的活火山与高频率的火山爆发活动。
It has a high density of active volcanoes, and a high frequency of volcanic eruptions.
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