volcanic phenomenon的意思|示意

This phenomenon occurs when the effect of strong volcanic activities begin to weaken and the equatorial trough fills up and retreats southwards.

这种现象发生在强火山活动影响开始减弱，赤道槽南移填塞以后。

It just as windy, rain, lightning, landslides, volcanic eruptions, often occur on Earth is a natural phenomenon.

它就象刮风、下雨、闪电、山崩、火山爆发一样，是地球上经常发生的一种自然现象。

Earthquakes are of the earth's surface vibration, this is like the wind, rain, and lightning, debris flow, volcanic outbursts on earth, is often happened a natural phenomenon.

地震是地球表面的振动，这就像风、雨和闪电、泥石流、火山爆发一样，目前地球上经常发生的一种自然现象。