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Students of human migration speak of "push" and "pull" factors, which influence an individual's decision to move from one place to another.

研究人类迁移的学生们谈到“推”和“拉”因素，这些因素会影响个体是否会从一个地方迁移到另一个地方。

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People here can hardly imagine the scale of this human migration.

这里的人们很难想象春运人流的规模。

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Millions more used buses and cars in what is believed to be the world's biggest annual human migration.

VOA: standard.2010.02.14

The president said the United States is prepared to engage in a dialogue with the Cuban government that includes human rights, free speech,democratic reform, migration,and economic issues.

VOA: standard.2009.04.17

He fixes the drones that protect earth's only remaining industry, a vast extractive operation that's supposedly providing power for an ongoing human migration to Titan, Saturn's largest moon.

WSJ: Oblivion: Earth, Plot in Ruins | In the House | Film Reviews by Joe Morgenstern

Manfred Kayser says ancestry markers can - at best - trace an individual to a broad region: "Human migration history has produced no sharp genetic borders and no sharp appearance borders, " he explains.

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So, I chatted with them, and in the course of things brought up the Genographic Project, which aims, using genetic mutations as signposts, to map human migration from our origins in Africa to all the places we live today.

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