4月20日，兰的家乡遭受了一场强烈的地震。

Lan's hometown was hit by a strong earthquake on April 20.

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令人们十分惊讶的是，强烈的地震过后，那栋老建筑还在那里。

To people's great surprise, the old building still remained after the strong earthquake.

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在大型逆冲断层活动中，所有的压力都会释放，且会造成一些世上最强烈的地震。

During a megathrust event, all of that stress releases and some of the world's most powerful earthquakes occur.

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