Most importantly, it needs to direct light where it is needed.
最重要的是，它需要引导光线到需要的地方。
People give blood to the centers, where it is kept until it is needed for medical purposes.
人们向中心机构献血，直到医疗需要前，这些血会一直贮存在机构里。
This is hers, exclusively to use whenever it is needed.
只要她愿意，这是她所独有的。
The count value is put into % ecx as it is needed by rep prefix.
因为rep前缀需要count值，所以将它放入%ecx中。
It is needed for string data types so DB2 knows how long the chain can grow.
对于字符串数据类型，DB 2需要通过它来知道这个链可以增长到多长。
Some cells produced in bone, called osteoblasts, build bone where it is needed.
有些细胞源自骨骼，称为造骨细胞，在需要时可以构造骨骼。
All relevant data is in the palm of a soldier's hand whenever it is needed.
士兵需要的所有相关数据都必须在手掌之中。
Using this feature ensures that Hibernate loads the data only when it is needed.
这个特性确保Hibernate只在需要时装载数据。
Furthermore, it is needed to understand the meaning of data elements following it.
另外，需要有它才能理解它后面的数据元素的含义。
It is needed later to act as the client when we test the file using the Web Service Explorer.
在作为客户来使用WebServiceExplorer测试文件时，这是必需的。
The test environment is too small, or it is overcommitted and not available when it is needed.
测试环境太小，或者测试环境过度使用，而需要时不可用。
This fact results in being prompted for this information once per session, the first time it is needed.
这样的事实导致每次会话都提示这是第一次需要此信息。
And the wider Nato mission which is to protect civilians - that will continue for as long as it is needed.
更广泛的北约任务——保护平民——只要有必要就将继续进行。
I'll explain below how this interpolation and prediction works, but first let me show you why it is needed.
下面我会阐明插值与预报是怎样工作的，但首先让我说明下为什么需要这些。
Hence, there is no guarantee that a service implementation will be delivered when it is needed for unit testing.
因此，不能保证在需要进行单元测试时能够提供服务实现。
Given the cost of retrieving a large document, it is prudent to avoid loading the entire document until it is needed.
若考虑到检索大型Document的代价，除非必需，否则就应该避免加载整个文档。
Fibre property testing, rarely done on a regularbasis, is now available to process operators exactly when it is needed.
纤维特性测试以前很少定期进行，而现在操作员可以随时进行测试。
The pull style, on the other hand, builds up the output document by pulling content from the source document as it is needed.
另一方面，拉样式根据需要通过 拉出源文档中的内容来构建输出文档。
It is needed when there should be a specific list of constant values to be used for the simple type defined by the enumeration.
当枚举定义的简单类型使用常数的特殊列表时，就会需要这种类型了。
What is worse, in some cases these policies will sharply constrain future domestic consumption, just when it is needed most.
更糟糕的是，某些情况下，这些政策将在未来最需要国内消费的时候，对其构成严重制约。
Application servers employ a process called passivation, in which an EJB can be deactivated and stored on disk until it is needed.
应用服务器使用一种称为挂起的过程，在这个过程中，EJB可以得到释放，并在需要使用之前一直被存储在磁盘上。
It can request data to be loaded in before it is needed, and then go on to perform other tasks while waiting for the data to be loaded.
它可以请求数据在需要之间就被加载，然后可以在等待加载数据的同时继续执行其他任务。
These statistics are easy to gather, but without an unintrusive means of retrieving the data when it is needed, they are not very useful.
这些统计值容易搜集，但是在需要数据的时候，如果没有非侵入性的数据检索机制，那么这些值就不太有用。
But others contend that such restrictions could dull America's edge in innovation, just when it is needed to help revive the economy.
但是另一些人认为这些限制仅仅是来帮助恢复经济，却会减弱美国的革新优势。
But others contend that such restrictions could dull America's edge in innovation, just when it is needed to help revive the economy.
但是另一些人认为这些限制仅仅是来帮助恢复经济，却会减弱美国的革新优势。
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