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1·A natural hazard like an earth tremor.

一种自然界存在的危险，如小地震。

2·Office workers ran for their lives as an earth tremor shook the center of town.

地颤使镇中心摇晃时，工作人员都各自逃命。

3·A faint earth tremor caused by natural phenomena such as winds and strong ocean waves.

微震，脉动由自然现象，如风或强海波引起的轻微地球震动。

4·A faint earth tremor caused by natural phenomena, such as winds and strong ocean waves.

微震，脉动由自然现象，如风或强海波引起的轻微地球。