地震系统是一个开放系统，它受到地球内、外许多动力因子的影响。
The seismological system is an open one which is affected by a number of dynamic factors both within and outside the earth.
在全球构造驱动力源与驱动机制研究方面，开始由单一动力驱动机制研究转入多种动力因子所构成地球动力系统的综合研究。
The geodynamic study of global tectonics has developed from a single dynamic driving mechanism to the geodynamic system consisting of many dynamic factors.
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