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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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Mining and human migration there threaten critical habitat for the okapis, but for now, they persist in quiet mystery. —Amanda Fiegl

那里的采矿业和人们的迁居威胁到霍家狓极其重要的栖息地，但是就目前而言，它们依然保持着低调神秘。

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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.

BBC: Painting a suspect's portrait with DNA

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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