单词：earthquake focus
earthquake focus的用法和样例：
例句
- The focus of the earthquake is eighty miles from our city.这次地震的震源在距我市八十英里的地方。
- From an earthquake source within an elastic medium, both types of body waves will propagate outward into the medium.这两种体波将从弹性介质中的震源出发，向外传播到介质中去。
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