Generally, the reason for such seasonal back-and-forth movement is to seek resources that aren't available within a single area year-round.
一般来说，进行这种季节性往返迁移是为了寻找在一个地区无法全年获得的资源。
The origins, though not the cause of Ebola-Sudan, can be traced back to a single individual in a Sudanese town.
苏丹埃博拉病毒最早可以追溯到苏丹小镇的一个人身上。
First produced in a lab back in 2004, graphene is essentially a single layer of pure carbon atoms bonded together in a honeycomb lattice so thin it's actually considered two-dimensional.
石墨烯最早在2004年诞生于一个实验室，本质上是一层由纯碳原子组成的蜂窝状晶格层，薄到竟被认为是二维物质。
Go back in history and this was part of our survival repertoire; like most animals, we drew on our sense of smell, when visual information was scarce, to single out prey.
回顾历史，这是我们生存技能的一部分；像大多数动物一样，当视觉信息匮乏时，我们利用嗅觉来识别猎物。
Some writers create an entire work before going back to read what they have written, while others may rewrite a single paragraph many times before moving on.
有些作家在回头阅读之前已经创作了一部完整的作品，而另一些人在继续写作之前可能会把其中的一个段落重写很多次。
In the longer run, a firm proposal may emerge on the continent to back the single currency with some kind of fiscal co-ordination across the EU.
从更长远来看，欧洲大陆也许会出现支持单一货币的强烈提议，整个欧盟在某种程度上都需要财政合作。
Certainly, all three operators-the single, double, and back quotation marks-serve a valid purpose, but like exceptions in English, memorizing and mastering the variations can be maddening.
当然，这三种操作符(单引号、双引号和反撇号)都有合法的用途，但是与英语中的例外一样，记住和掌握这些细微差异很令人头疼。
You could even just use a single pointer and write data back into the buffer you got it from, although this might be a nuisance to program for on the other end.
您甚至只需要使用一个指针并将数据写回到读取数据所使用的缓冲区中即可，不过这对于另外一端的编程来说可能有些麻烦。
According to planetary scientist Robin Canup, all three of Pluto's satellites could trace back to a single impact.
据行星学家罗宾·卡纳普说，冥王星的所有三个卫星可以追溯回同一次撞击。
It turned me back into the imperious single girl, the one was above dating and didn't need to impress a man.
我重获单身女身份，飞扬跋扈，不要约会，不必担心男人怎么想。
B. FindByPrimaryKey: in this method, the objective is to get back a single OperatingSystem instance from the CIMOM using the primary keys of an entity bean.
FindByPrimaryKey：在这个方法中，其目标是使用实体bean的主键从CIMOM中返回单个OperatingSystem实例。
Back in the '80s, however, when Mach was created, single-processor machines were the norm.
然而，回到上世纪80年代，当Mach创建时，单处理器机器是标准。
I think, looking back, that this was the single best thing about Ault, the sense of possibility.
如果回头来看，我想这是奥尔特最了不起的一点：让你感到还有可能。
Results are readily displayed and allow the user to quickly understand duplicated values or drill back into the full frequency distribution for single or multiple columns as Figure 11 shows.
评价结果立即显示出来，使用户可以快速理解重复的值，或者回过头查看单个或多个列的全部频率分布，如图11所示。
"Pain is probably the earliest most primitive experience around, going all the way back to single celled organisms," he says.
“疼痛可能是最早的也是最原始的体验，回归到最简单的我们称之为有机体的东西，”他说到。
Aeroplanes flew back and forth along a single route, often between quiet, out-of-the-way airports, rather than using busy hubs.
飞机在单一路线上来回飞行，通常降落在宁静又偏僻的机场，而不是繁忙的交通枢纽。
For example, in this outbreak, person-to-person transmission cannot be traced back to a traveler, or a single closed community such as a school or workplace.
例如，在这一突发事件中，人与人之间的传播不能追溯到某一个旅客或单一的社区如学校或工作场所。
In this pattern, external business partners interact with multiple back-end business processes through a single front-end application.
在这个模式中，外部业务伙伴通过单个前端应用程序与多个后端业务流程进行交互。
This is an important additional capability because a solution that leverages new sensor data could evolve beyond a single back-end processing system.
这是一个重要的附加功能，因为利用新的传感器数据的解决方案可能会演变为超出单个后端处理系统的范围。
The single executable passes the locale information to the back-end data system.
单一可执行文件将语言环境信息传递给后端数据系统。
Use XML/XSLT only in cases where you have multiple presentation output types that must be supported by a single controller and back-end.
只有在需要多种表示输出类型，并且输出类型被单一的控制器及后端支持时才使用XML/XSLT。
The back-end data system finds the correct data, and sends it back to the single executable.
后端数据系统找到正确的数据，并将其发送回单一可执行文件。
Once you have made the changes to the XML document in memory, a single function call writes it back out to the configuration file.
在对内存中的XML文档完成了相应的修改之后，只需使用一个函数调用就可以将其写回到对应的配置文件中。
The application is built on a single executable base and retrieves back-end data based on the customer's cultural preferences.
应用程序建立在一个单一可执行文件基础上，并且根据客户的文化首选项检索后端数据。
This code fragment can be reduced back to a single line by moving the JSTL code into a reusable tag file that outputs the element.
通过将JSTL代码移动到输出元素的可重用标记文件中，就可以将此代码片段缩减为一行。
This code fragment can be reduced back to a single line by moving the JSTL code into a reusable tag file that outputs the element.
通过将JSTL代码移动到输出元素的可重用标记文件中，就可以将此代码片段缩减为一行。
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