You should take care to throw exceptions in these situations, so the user will know that the action could not be performed exactly as they requested.
在这些情况下，您应该负责抛出异常，让用户知道他们请求的操作无法按照期望执行。
Another benefit is that memory consumption is optimized, as objects are only loaded into memory when they are requested.
另一个好处就是对内存消耗的优化，对象只有在被请求时才会被加载到内存中。
This behavior known as Lazy Loading ensures that dependents are only loaded as they are specifically requested and hence makes it possible to avoid unnecessary creation of objects.
延迟加载行为保证了依赖的数据只有在真正请求时才会被加载进来，这样就可以避免创建无谓的对象。
The same properties are requested as before, but now you will actually get different results from the property values, since they are now evaluated with a different user.
虽然请求的是与先前一样的属性，但现在实际获得的属性值结果却不同，原因是现在它们的值是通过不同的user得到的。
As for retailers, no longer would they need to excuse themselves for not having the requested colour in stock.
对于零售商来说，再也没有什么借口说自己没有这种库存的颜色。
ItemFinders facilitate browsing because they can retrieve all of the items contained within a Folder or WorkQueue, as well as any additional item handles that have been requested.
ItemFinders有助于浏览，因为它们可以检索一个Folder或WorkQueue中包含的所有条目，以及请求的任何其他条目句柄。
They also requested abundant vantage points between the interior Spaces and separate floors as well as between the interior and the outdoors.
他们也要求室内空间和各楼层之间、室内外间有大量有利位置。
Managing the approved changes when and as they occur, by regulating the flow of requested changes.
控制申请变更的流程，在发生变更时管理批准的变更。
In the course of that meeting, they requested that I "step aside" as CEO of GM, and so I have.
在这个会议过程中，他们要求我从通用汽车的首席执行官位置上“走开”，因此我照做了。
In the course of that meeting, they requested that I "step aside" as CEO of GM, and so I have.
在这个会议过程中，他们要求我从通用汽车的首席执行官位置上“走开”，因此我照做了。
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