地震是一种自然现象。
地震是一种自然现象，经常集中发生于地球上某些地区。
Earthquake is a phenomenon in nature which tends to cluster in some parts of the world.
地震是一种经常发生的自然现象，地表之下每天要发生几千次的震动，但大地震还是比较少见的。
Earthquakes are a common occurrence, rumbling below earth's surface thousands of times every day. But major earthquakes are less common.
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。
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。
Earthquake is the shake of earth's surface, like wind, rain, lightning, debris flow, volcano's eruption, which is a natural phenomenon.
地震和日常所见的风雨、雷电一样，是一种较为普遍的自然现象。
The earthquake and daily sees the wind and rain, the thunder and lightning are the same, is one kind of more universal natural phenomenon.
地震和日常所见的风雨、雷电一样，是一种较为普遍的自然现象。
The earthquake and daily sees the wind and rain, the thunder and lightning are the same, is one kind of more universal natural phenomenon.
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