Man-made earthquake is one of the important methods to investigate deep crustal tectonics.

人工地震是研究深部构造的重要方法之一。

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All of them took place at the Punggye-ri site, the same area where several monitoring agencies detected man-made earthquake activity on Wednesday morning.

这三次核试验都是在丰溪里核试验场进行的。星期三上午，几个监督机构都在该地区监测到了人为地震活动。

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Before the disaster, I thought I was a brave man. The earthquake made me realize the truth.

在这次灾难之前，我也曾经认为自己是一个比较勇敢的人，但灾难让我认识到自己并没有那么勇敢。

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Before the disaster, I thought I was a brave man. The earthquake made me realize the truth.

在这次灾难之前，我也曾经认为自己是一个比较勇敢的人，但灾难让我认识到自己并没有那么勇敢。

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