正如您所见，del . icio . us返回了HTTP 503(服务不可用状态代码)。
As you can see, del.icio.us was returning an HTTP 503 (Service Unavailable status code).
此方法容易受到用于禁用项的常规警告的影响：避免由于偶然地禁用重要项而使程序处于不可用状态。
This approach is subject to the general caveat that applies to disabling items: Avoid leaving your program in an unusable state accidentally by disabling crucial items.
这就意味着在comet流样式通信持续期间，从客户端设备到后端服务器的每个系统上都至少有一个连接处于不可用状态。
This means that during the duration of a Comet streaming style communication, at least one connection is tied up on each system from the client device to the backend server.
数据库状态，可用或不可用。
另外，一些有趣功能(例如：高动态范围图像)，使用后需要较长时间的处理，这段时间，相机处于不可用的状态。
And some of the fancy modes (like high dynamic range) require a lot of processing after each shot, during which time you can't use the camera.
您可以看到状态目前不可用，因为您需要重启服务器使变更生效。
You can see that the status is currently unavailable, because you need to restart the server for changes to take effect.
如果信号量不可用，它将被置为睡眠状态；如果向它传递了一个致命信号，则会将它从等待者列表中删除，并且需要响应此信号。
If the semaphore is not available, it's put to sleep; if a fatal signal is delivered to it, it would be removed from the waiters' list and would have to respond to the signal.
磁盘上数据的状态可能不可用，因为捕获快照时，磁盘上的数据被视为处于崩溃一致状态。
The state of the data on a disk may not be useable because when the snapshot was taken the data on the disk was considered to be crash consistent.
万一指定的资源不可用，返回404 (NotFound)状态码是一个不错的主意。
In case the specified resource is not available, it's a good idea to return a 404 (not Found) status code.
而一种状态的最佳处理方法不可用并不意味着这种状态会不那么危险了——事实上，在这种情况下该状态会变得更加危急。
And a condition is not less grave just because the best treatment for it is unavailable-in fact the condition is more serious in that case.
扫描仪不可用。请检查扫描仪连接状态。
Scanner is not available. Check the scanner connection status.
运行状态（OperationalStatus） --该运行状态功能不仅定义了用于互操作性状态更改的事件，也定义了三种很简单的状态级别（可用，不可用和未知）。
Operational Status -- The Operational Status capability defines three very simple status levels (available, unavailable, and unknown) as well as events for status changes for interoperability.
当前线程状态当前唯一状态不可用的时候它也可以调用。
It is okay to call this function when no current thread state is available.
一个新链路的主要状态最初设置为不可用(una)。
The major state of a new link is initially set to unavailable (una).
可以临时使解决方案文件夹中的所有项目在解决方案中不可用，然后再将这些项目还原为可用状态。
You can make all the projects in a solution Folder temporarily unavailable within a solution, and then restore these projects to available status.
当结构包含引用类型作为成员时，必须显式调用该成员的默认构造函数，否则该成员将保持未赋值状态且该结构不可用。
When a struct contains a reference type as a member, the default constructor of the member must be invoked explicitly, otherwise the member remains unassigned and the struct cannot be used.
但是，如果身份验证服务器不可用，则事件处理程序会使应用程序重新恢复为脱机状态。
However, if the authentication server is unavailable, the event handler returns the application to the offline state.
文摘：利用马尔可夫过程给出了串联可修系统各状态的不可用度表达式及平均修复时间表达式。
Abstract: In this paper, Formula of MTTR( meam time to repair) and unavailability of every states for series repairable system are given using Markov processes.
文摘：利用马尔可夫过程给出了串联可修系统各状态的不可用度表达式及平均修复时间表达式。
Abstract: In this paper, Formula of MTTR( meam time to repair) and unavailability of every states for series repairable system are given using Markov processes.
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