Variations in the reflection times from place to place on the surface usually indicate structural features in the strata below . 反射波在地面从一处到另一处的时间变化,通常是地下岩层构造特征的标志。
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The study on formation cause of plagioclase is closely related to formation cause of geological structure 历史上发生的陨击事件对地球表面岩层构造产生了极其严重、深刻和长远的影响。