Early human history is the story of migrations and counter-migrations back and forth across the globe.早期人类历史就是在全球范围内来回不断迁移的历史。Even if these migrations can be absorbed, absorption will be only a temporary solution.即使这一批一批的移民能够被吸收，也只是暂时的权宜之计。She never lost interest in the birds' morning feeding activities, migrations, mating habits.她对鸟类的早晨觅食活动、迁徙及交配习惯一直感兴趣。