Why did the near extinction and migrations of wild animals occur?
为什么会发生野生动物濒临灭绝和迁徙的现象？
One opinion is that the paintings were a record of seasonal migrations made by herds.
一种观点认为，这些画是兽群季节性迁徙的记录。
They prevent fish migrations and change aquatic habitats essential for native species.
它们阻止了鱼类迁徙，并改变了对本地物种至关重要的水生栖息地。
Tooth analyses also suggest that there were two later migrations of Na-Denes and Eskimo-Aleut.
对牙齿的分析还表明，纳-德内人和爱斯基摩-阿留申人后来还有过两次迁徙。
The biologist Hugh Dingle has identified five characteristics that apply, in varying degrees and combinations, to all migrations.
生物学家休·丁格尔已经识别出五个特征，这些特征在不同程度和组合上适用于所有的迁徙。
Dates given for the migrations should nevertheless be treated with caution, except where supported by hard archaeological evidence.
除非有确凿的考古证据支持，否则我们应谨慎对待给出的迁徙日期。
Unfortunately, this explanation fails to explain the hidden locations, unless the migrations were celebrated with secret ceremonies.
遗憾的是，这种解释未能说明这些位置为何如此隐蔽，除非迁徙是通过某些秘密的仪式来庆祝的。
Instead of following the cattle on their annual migrations, the hunters began to prevent the herd from moving from one spot to another.
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。
A likely explanation for this involves the fact that intercontinental migrations require both a land bridge connecting the two continents and the suitable habitat both on and across that land bridge.
对此，有一种可能的解释是，洲际迁移既需要连接两个大陆的大陆桥，也需要大陆桥上和桥对面存在合适的栖息地。
Runs all applicable migrations.
运行所有可应用的迁移。
But migrations have limitations too.
但是迁移也有一些限制。
Two more common problems also relate to migrations.
另外两个常见问题也与迁移有关。
From there, two successive migrations headed east.
之后，这一种族的两支后裔又开始从中东出发并向东进发。
AIX storage migrations can be time consuming and tricky.
AIX存储迁移既耗时又需要技巧。
The migrations generator is managing the numbers for you.
迁移生成器负责管理编号。
In Rails applications, schema changes occur through migrations.
在Rails应用程序中，模式的更改是通过迁移发生的。
To use migrations, you only need a Rails project and a database.
要使用迁移，只需要一个Rails项目和一个数据库。
I still had to specify all my validations and initial migrations.
我仍然需要写明所有的验证器和初始迁移。
Global variable support for migrations from Oracle to DB2 9.5 luw.
对从oracle到db 2 9.5luw迁移的全局变量支持。
The other category is referred to as customer migrations situations.
另一类是客户迁移情况。
This shows that Rails is managing the sequence of migrations for you.
这表明Rails正在管理迁移的次序。
MTK V1.4 supports migrations to a second new target, DB2 UDB for z/OS.
MTKV1.4 支持另一种新的迁移目标，DB2UDBfor z/OS。
Rails runs the up methods on all migrations that haven't been run yet.
Rails运行所有还没运行的迁移上的up方法。
There is a surge in Unix to Linux migrations happening in the enterprise.
企业正在出现一股从Unix向Linux移植的热潮。
By default, Rails migrations will encode a string column as a varchar (255).
默认地，Rails迁移会将string列按varchar(255)编码。
rake runs up migrations from least to greatest, and down migrations in reverse.
rake按照编号从小到大运行up迁移，从大到小运行down 迁移。
LiquiBase: Download LiquiBase to begin performing automated database migrations.
LiquiBase：下载LiquiBase，开始执行自动化的数据库迁移。
In my years of experience, I have performed dozens of successful LPAR migrations.
根据多年的迁移经验，我成功迁移过许多LPAR。
Birds also have built-in timepieces which send them off on fall and spring migrations.
鸟类也有天生的时间感应器指导它们秋春迁移。
Runs the up methods of all migrations having a number greater than the current migration.
运行编号大于当前迁移的所有迁移的up方法。
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