大迁徙

Several hundred million Chinese peasants have moved from the countryside to the cities over the last 30 years, in one of the largest, most rapid migrations in history.

过去的30年里，数亿中国农民从农村迁入城市，完成了历史上规模最大，速度最快的人口大迁徙。

Every year millions of wildebeests migrants west from the draught Serengeti Plain to wetland in the Mara and these wildebeests were just part of the marching team.

每年夏天，上百万只角马从干旱的塞伦盖蒂北上迁徙到马赛马拉的湿地，这群角马正是大迁徙的一部分成员。

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。

The next decennial census in 2020 should tell us whether the influx of African-Americans into the South will be large enough to be considered a third Great Migration.

十年一次的下次人口普查将在2020年进行。届时的普查结果将告诉我们迁移到南方的非裔美国人是否足够构成第三次大迁徙。

Although political instability in Bolivia is a worry, the main risk to Chile from that direction-an exodus of Bolivian refugees-is hardly a military problem.

尽管玻利维亚的时局不稳给智利带来的忧虑，但那个方向给智利带来的主要危险根本谈不上是军事问题——仅仅是玻利维亚的难民大迁徙。