You decide that your users would not like to see welcome messages disappear after they've been added, so you choose not to delete any records within the down migration.
它认定用户在加入之后不想看到欢迎信息消失，所以选择向下迁移时不删除任何记录。
There is growing support for the theory that migration took place much earlier, by sea, following a coastal route along Alaska and down the northwest coast.
越来越多的人支持这样一种理论，即移民发生得要早得多，是沿着阿拉斯加沿海路线，沿西北海岸而下通过海路进行的。
Nevertheless, you can realize huge benefits from this task â “ not only for the organizational planning, but also for the rest of the migration, down to operation and maintenance.
无论如何，可以通过这个任务获得巨大的收益 —— 不仅对于组织规划有好处，对于迁移过程的其余部分直至操作和维护，都很有好处。
Rarely is the migration of a production run time environment a simple matter of shutting everything down, installing new hardware and starting everything back up.
迁移生产运行时环境绝大多数情况下不可能是简单地关闭所有程序、安装新硬件和重新启动所有程序。
If possible, you should try to migrate directly into one of the three specific types; otherwise, you will likely end up needing another migration down the road.
如果可能，应尽量直接迁移到这三种具体类型之一，否则此后可能还需要进行一次迁移。
While this is not a perfect solution and will cause problems with things like merged menus, it does get developers a little bit further down the migration path.
尽管这个解决方案并不完美，并且在如合并菜单等方面可能出现问题，但是这样确实使得开发人员在迁移的征途上向前迈进了一步。
The QA environment can withstand generally longer periods of down time which makes it an appropriate environment to test your migration plan.
QA环境通常容许更长时间的停机，这使它成为测试您的迁移计划的适当环境。
For instance, Brazil's northeast, long the source of internal migration to more-prosperous cities down south, now outpaces the rest of the country in growth.
举例来说，巴西长期以来都是东北地区的人向南部那些更加繁荣的城市移民，而这一地区现在的经济增长率已经超过国内其他地方。
You need not drop down into SQL to create an index — you can simply use a migration.
无需采用SQL创建索引——可以简单地使用迁移创建。
Each migration, has an up and down method.
每个迁移都有up和down方法。
Each change in the database schema has its own migration object, encapsulating a move up and a move down. Listing 1 shows an empty migration.
数据库模式中的每个变化都有自己的迁移对象，迁移对象包装了前进和后退。
Only months or years down the road (depending on growth rate) will they plan for a migration to external disks, and usually tapes will only be in place after numerous years.
而仅仅几个月或几年之后（取决于增长速率），他们就会开始规划移植到外部磁盘，而磁带通常要在几年以后才会参与进来。
For the incremental approach, the migration must be broken down into manageable parts.
对于渐进式方法，迁移过程必须划分为多个可管理的部分。
This usually boils down to calling the migration tool with the relevant parameters and feeding it the pre-processed source data.
这通常使用相关的参数调用移植工具，并且将预处理的源数据传给它。
Third, Heil mentioned that great white shark migration patterns take the sharks down the U.S. East Coast during the summer, putting them closer to populated areas.
第三，海尔提到夏季大白鲨沿着美国东岸洄游，而这海岸正是人们海上活动聚集的地方。
Third, Heil mentioned that great white shark migration patterns take the sharks down the U. s. East Coast during the summer, putting them closer to populated areas.
第三，海尔提到夏季大白鲨沿着美国东岸洄游，而这海岸正是人们海上活动聚集的地方。
After a successful deployment manager migration, you have the option of starting the V5 nodes immediately, or shutting down some of these nodes and migrate to V6.
成功迁移部署管理器之后，可以选择立即启动V 5节点，或者关闭某些V 5节点并迁移到V6。
Rarely is the migration of a run time environment a simple matter of shutting everything down, installing new hardware and starting everything back up.
运行环境的移植不能把所有东西都关掉，来安装新的硬件，并且备份所有的内容。
One answer is that the powerful state may slow down this migration (either intentionally or unintentionally).
答案之一在于实力强大的国家也许放慢了人口迁移的步伐(有意无意地)。
Not long after that, both of these hard-hearted soldiers came down with some strange sickness the doctors couldn't cure, and before the next migration of the wild geese, both men were dead and buried.
不久，这两个士兵就得了一些让医生束手无策的怪病，在第二年雁迁徙前，两人都死了。
You wouldn't want to calibrate all of the massive loss of life and lost culture in the forced migration that was incurred in things like that, back down to dollars and cents.
风暴会导致生命大规模消亡及强迫迁移后的文化流失，你们可能不希望以钱来衡量这些损失。
As we approach the challenge of getting net migration figures down, it is in my view essential that we look at how we do this in a way that protects the vital interests of our economy.
在减少净移民这个问题上，我认为，选择一个能保障我国经济利益的做法至关重要。
The wave-field continuations along up-going wavefront or down -going wavefront are the two methods we can take to ensure the all -dip migration of wave field.
沿上行波波前或下行波波前进行波场延拓是确保波场全倾角归位仅能采用的两种延拓方法。
The process of migration and accumulation of ions in formation water was very complex in continental down-faulted basin.
陆相断陷盆地中，地层水中离子的运移、聚集过程比较复杂。
The process of migration and accumulation of ions in formation water was very complex in continental down-faulted basin.
陆相断陷盆地中，地层水中离子的运移、聚集过程比较复杂。
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