the migration of animals in the Serengeti塞伦盖蒂大平原上的动物迁徙

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。

the migration of Soviet Jews to Israel苏联犹太人向以色列的迁移

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。