In 1923 a major earthquake struck the city.
1923年，一场大地震袭击了这座城市。
That is why many after-shocks follow a major earthquake.
这就是为什么很多余震紧跟在一个大地震之后。
Last year a major earthquake hit the area, and many people lost their homes.
去年一场大地震袭击了这个地区，很多人无家可归。
When the major earthquake struck last May, it originated 3.4 miles from the reservoir.
发生于去年5月份的大地震，震中距离水库只有3.4英里。
Signal earthquake and the major earthquake seem to be controlled by the same structural system.
信号震和主震沿同一构造体系活动；
For Chinese insurers, the earthquake will be the second major blow this year.
对中国保险公司来说，此次地震是今年以来遭受的第二次重击。
There are three major types of earthquake.
地震主要分三种。
Whether the earthquake could trigger other major quakes is not known.
地震是否会引发其他大规模的震动也还未知。
Whether the earthquake could trigger other major quakes is not known.
地震是否会引发其他大规模的震动也还未知。
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