The migration phenomena reveal a process that the seismicity in both the far-field and the near-field becomes intensive and quiet alternatively before a main shock.

这种迁移现象反映出大震前远震源区和近震源区内地震活动交替活跃和平静的过程。

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On paper, the commission's aim is straightforward: to respond to citizens' concerns about big, trans-national phenomena such as climate change, migration or globalisation, and convince them that action at the European level is the answer.

ECONOMIST: Charlemagne