In different historical periods, the object of study and method of study vary.
在不同的历史时期,研究对象和研究方法有所不同。
It illustrates that application of active fault method and modern chronology method in study of metaphase-forepart difficult or absent historical earthquake is indispensable and conceivable.
本文以两个应用实例说明把活断层工作方法及现代年代学方法引入早期疑难或缺失的历史地震研究中是必要的和可能的。
The comparative analysis method of historical data was used to study the coastal erosion along the south coast of the Laizhou Bay during 1958 to 2004.
采用历史资料对比分析的方法,对莱州湾南岸1958 - 2004年的海岸侵蚀进行了研究。
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