Their house, which was solidly built, resisted the main shock.
他们的房子修建得很坚固，经受住了主震。
It can happen with a month, or within days, from the main shock.
余震可以在主震发生后的一个月或者几天之内发生。
Within an hour after the main shock, two aftershocks, one of magnitude 5.0 and the other 5.2, occurred.
主震后不到一个小时的时间里，又发生了两次余震，一次5.0级，一次5.2级。
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