猎人们不再跟随牛群进行一年一度的迁徙，而是开始阻止牛群从一个地方迁移到另一个地方。

Instead of following the cattle on their annual migrations, the hunters began to prevent the herd from moving from one spot to another.

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他们的迁徙可能是人口增加引起的，这一人口增长是由人们逃离撒哈拉沙漠的干燥或干涸的迁移造成的。

Their migration may have been set in motion by an increase in population caused by a movement of peoples fleeing the desiccation, or drying up, of the Sahara.

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为了寻求更好的生活，数千名吉普赛人已经向西迁移。尤其是欧盟的扩张，可以让他们利用扩张中的自由迁徙规则。

Thousands have migrated westward to seek a better life, particularly as the expansion of the European Union has allowed them to take advantage of freedom-of-movement rules.

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