Earthquakes are of the earth's surface vibration, this is like the wind, rain, and lightning, debrisflow, 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。
2
Several fallen trees and other debris had dammed up the water, and the fast flow during the floods had excavated the soft earth, leaving behind a fairly deep pool beneath the trees.