During the last recession, migration to the sunbelt accelerated.
前一个经济萧条期间，向美国南部阳光地带移民的速度加快了。
What does this migration not do?
这种迁移不能做什么？
Assisted migration really needs this level of oversight, and soon.
辅助迁移确实需要这个层次的监督，而且是急需。
The effects of migration are more complex than these theorists presume.
移民的影响比这些理论家假设的要复杂得多。
Human behaviour, however, is having a detrimental impact on animal migration.
然而，人类行为正在对动物迁徙产生不利的影响。
Migration is usually defined as "permanent or semipermanent change of residence".
移民通常被定义为“永久或半永久的居住变化”。
Seasonal migration is another form of escape, especially for large mammals or birds.
季节性迁徙是另一种逃避方式，特别是对大型哺乳动物或鸟类来说尤为如此。
"Regions of outward migration allow planets and planetoids to survive, " Mac Low said.
麦克·劳说：“向外迁移的地区使行星和小行星得以生存。”
As recently as five years ago, US migration was twice the rate of European Union states.
就在5年前，美国的移民率还是欧盟国家的两倍。
The most radical strategy being debated among conservation biologists is Assisted Migration.
保护生物学家们争论的最激进的策略是辅助迁移。
Without more research, we can't predict if Assisted Migration will work for any given species.
没有更多的研究，我们无法预测辅助迁移是否适用于某一特定的物种。
Whether to use Assisted Migration, this debate is mostly within the biology community right now.
是否应该采用辅助迁移目前主要是生物学界争议的话题。
But was there one major wave of migration across the Bering Strait into the Americas, or several?
但是有没有一次或几次大移民浪潮是穿过白令海峡到达美洲的呢？
Was there only one outward migration from a single point in Asia, or several from different points?
在亚洲，是否只有一个或多个移民点向外迁移？
When the lemmings' food supply becomes too low to support the population, a singular migration commences.
当旅鼠的食物供应不足以维持种群时，一次特别的迁徙就开始了。
The most influential proponent of the coastal migration route has been Canadian archaeologist Knut Fladmark.
沿海移民路线最具影响力的支持者是加拿大考古学家克努特·弗拉德马克。
From this evidence it was deduced that there had been three major waves of migration across the Bering Strait.
从这个证据可以推断，横跨白令海峡的大型移民潮曾经有过三次。
When the planetarium sky matched the sky outside, the birds fluttered in the direction of their normal migration.
当天文馆的天空与外面的天空相匹配时，鸟儿们就朝着它们正常迁徙的方向飞翔。
However, when the lemmings' food supply becomes too low to support the population, a singular migration commences.
然而，当旅鼠的食物供应变得太少而无法维持种群时，一次特别的迁徙就开始了。
The book he's trying to read goes back to long before even the first word was written, and it is a story of migration.
他尝试阅读的这本书可以追溯到很久以前，甚至在第一个字被写出来之前，这是一个关于移民的故事。
Now as far as the Sahara goes, there is some recent literature that points to the migration of the monsoon in that area.
随着撒哈拉沙漠的移动，近期一些文献指出了该地区的季风迁移。
Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds.
某些海鸟在每年春季迁徙到北方繁殖地时，以这些鸟蛋为食。
Migration helped create humans, drove us to conquer the planet, shaped our societies, and promises to reshape them again.
移民帮助创造了人类，驱使我们征服了地球，塑造了我们的社会，并承诺再次改变他们的形态。
Migration is a complex issue, and biologists define it differently, depending in part on what sorts of animals they study.
迁徙是一个复杂的问题，生物学家对此有不同的定义，定义的方法部分取决于他们研究的动物种类。
Surprisingly, Bailyn suggests that those who recruited indentured servants were the driving forces of transatlantic migration.
令人惊讶的是，贝林认为那些雇佣契约仆役的人是跨大西洋移民的驱动力。
You know, I am writing that paper about whales and the path they travel as they swim through the ocean, their migration patterns.
你知道，我正在写那篇关于鲸鱼的论文，它是关于鲸鱼在海洋中游泳的路径以及它们的移动模式。
It was the midcontinental corridor between two massive ice sheets—the Laurentide to the west—that enabled the southward migration.
正是两块巨大的冰原之间的半大陆性质的通道——西面的劳伦斯泰德冰原——使人们向南迁移成为可能。
His definition is more intricate than Berger's, citing those five features that distinguish migration from other forms of movement.
他的定义比伯杰的更复杂，加入了区分迁徙与其他运动形式的五个特征。
The National Forest has recognised the path of the pronghorn, much of which passes across its land, as a protected migration corridor.
国家森林已经确认叉角羚的活动路径是一个受保护的迁徙走廊，许多叉角羚都会经过这里。
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