其特点是：1．所有的异常都取自每年年底的山东省地震会商报告，而不是取自地震后的震例总结或论文；

The characteristics are: 1, All of the precursors are chosen from the annual seismological consultations, not from sums up of events or essays ;

youdao

其特点是：1．所有的异常都取自每年年底的山东省地震会商报告，而不是取自地震后的震例总结或论文；

The characteristics are: 1, All of the precursors are chosen from the annual seismological consultations, not from sums up of events or essays ;

youdao