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。

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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。

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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。

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The Sudanese government's reaction to the naming of these suspects today indicates that they are dug in, that they are not prepared to cooperate with the international community - whether the United Nations in the form of admitting peacekeepers as they've been requested to do, or with the International Criminal Court.

NPR: Expert Calls for U.S. Military Mission in Sudan

The presence of Angolan, Zimbabwean and Namibian troops is seen as legitimate, since they were requested to intervene by the government.

ECONOMIST: Congo

But despite that security fix, other problems have already sprung up: New Jerseyites in Morris and Essex counties have reported that their emails were bouncing when they requested ballots or returned them, as first reported by Buzzfeed Monday evening.

FORBES: Despite Security Fixes, New Cracks Appear In New Jersey's Last-Minute Email Voting Scheme