填空题

In order to minimize the damages resulted from earthquakes in the future, further progress should be made in the field of ______.

【参考答案】

prediction and preparedness
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When an earthquake with level 7 in Richter scale rating is reported it means that its amplitude is ______ times stronger than a level 6 earthquake.
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In earthquake, long wave is the main source of damage because it causes the shake of ______.
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