It has been frequently assumed, but not proved, that the majority of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors.

人们常常假设，但没有证据证明，在所谓的“大迁移”中，大多数移民来自农村地区，这是由两个同时发生的因素推动的。

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It is called the Great Migration, and it is widely considered one of the most spectacular assemblies of animal life on the planet.

这叫做“大迁移”。这被广泛看作这个星球上最壮观的动物集结之一。

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A crocodile eats a young injured wildebeest during the great migration in the Mara River in Kenya which is infested with crocodiles lying in wait to kill.

角马跨越肯尼亚马拉河进行大迁徙时，河中会有许多鳄鱼出没，伺机而动。图中，一只鳄鱼吃掉了队伍中一只受伤的年幼角马。

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Another key event in the making of modernism is the great migration of African-Americans from the rural south to the urban north.

现代创作的另一个重要事件,是非裔美籍从南部乡下,往城市化的北部的大移民。

耶鲁公开课 - 现代诗歌课程节选

Behind this environment are the great social processes of migration and modernization that produced that new urban form, the metropolis.

在这种环境背后是移民和现代化的重大社会进程,所带来的新的城市形式，即大都市。

耶鲁公开课 - 现代诗歌课程节选

The Great Migration is the largest movement of animals on the planet.

BBC: Migration and the Masai Mara

Now 90, Mr Rogers came to California in 1940 from Oklahoma in the great migration from the Great Plains' dust bowl.

ECONOMIST: California is now divided more east-west than north-south

Right now, despite the great migration of time and money to the Internet, almost all brand messaging occurs in traditional media, especially TV.

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