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。
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。
For most people who have never been to China, the Spring Festival - which creates the world's largest human migration annually - is difficult to comprehend.
中国的春节创造了世界上最大规模的人类迁徙活动，每年如此。对于大多数没有到过中国的人来说，真的很难理解。
Selectivity of human migration has long been the focus of demographers and economists.
人口迁移的选择性一直以来都是人口学家和经济学家关注的焦点。
Selectivity of human migration long been the focus of demographers and economists.
人口迁移的选择性一直以来都是人口学家和经济学家关注的焦点。
About 230m Chinese are expected to take part in the world's biggest annual human migration.
预计约有2.3亿人将参加世界上规模最大的年度迁移。
Many scientists viewed them as a failed human migration from Africa, with no genetic connection to humanity today.
许多科学家认为，它们代表了人类走出非洲的一次失败尝试，与今天的人类没有基因联系。
Many scientists viewed them as a failed human migration from Africa, with no genetic connection to humanity today.
许多科学家认为，它们代表了人类走出非洲的一次失败尝试，与今天的人类没有基因联系。
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