Once the system or service has been made unavailable, legitimate clients are blocked from using the network service hosted by the system under attack ( See Figure 2).

1、

When a local service is unavailable, requests are transparently rerouted to a service provider elsewhere.

当本地服务不可用时，将请求透明地重路由到其他地方的服务提供者。

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2、

Voice service is temporarily unavailable. Calls cannot be completed at this time. We are working to fix these issues and apologize for the inconvenience.

语音服务暂时不可用。现在不能拨打电话。我们正在修复这些问题。对于给您造成的不便深表歉意。

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3、

There's also waitForService(), which blocks if a service is unavailable for the specified timeout ( or for ever, if the timeout is zero).

而waitForService（）则在服务不可用时阻塞一段时间（根据指定的timeout。

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4、

The attack eventually makes the service unavailable by establishing thousands of socket connection requests with the vulnerable system.

攻击会导致系统上产生大量套接字连接请求，最终导致服务不可用。

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5、

If you see the message" service unavailable," there is a problem with the application pool for the web application.

如果出现“服务不可用”消息，则web应用程序的应用程序池可能存在问题。

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6、

The fax service may be unavailable.

传真服务可能不可用。

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7、

The answer is that the service simply seems unavailable to external clients; from the external point of view, the service just appears to have successfully started a few seconds later.

答案是，服务仅对外部客户端不可用而已；从外部来看，服务只是过了几秒钟才启动成功。

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8、

The restricted permission service is temporarily unavailable. Try again later or contact your administrator.

该受限权限服务暂时不可用。请稍后再试，或与管理员联系。

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9、

We regret this service is temporarily unavailable.

我们很抱歉暂时不能提供这一服务。

《牛津高阶英汉双解词典》

10、

Lower socioeconomic groups rarely use cabs in France-in London and New York they do, extensively-and there are large areas of Paris where a taxi service is in effect unavailable.

在法国，中低收入阶层很少打车，不像在伦敦和纽约，那里的中低收入阶层经常打车；此外，巴黎还有大片区域事实上打不到车。

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11、

When a component calls a service and the service is unavailable, the runtime errors are thrown.

当一个组件调用一个服务、而该服务又不可用时，将抛出运行时错误。

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12、

The lender's customer service was unavailable for contact, and Caixin has found no office existed in the registered address of the owner company in Shanghai.

公司客服失联，据财新调查，上海并没有这家公司的注册地址。

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13、

Adding a simple prompt that says "Sorry this service is unavailable" if the feed is not processed correctly is helpful to the user in the event of such a failure.

如果无法正确地处理提要，那么最好增加一个简单的提示“Sorry this service is unavailable”，这可以帮助用户应付这种失败。

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14、

503 Service Unavailable The request was not completed. The server is temporarily overloading or down. Experimental Investigation on Ultimate Load-Bearing Capacity of PBL Shear Connectors

请求未能完成。服务器承载量超负荷。PBL传剪器极限承载力的试验研究

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15、

Send a503 ( SERVICE UNAVAILABLE) if something is wrong with the server.

如果服务器出现故障，将发送错误码503（SERVICE UNAVAILABLE）。

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16、

This paper analysised the advantage and availableness of correlation technique to detect the leaks on buried oil pipe line, together with how to solve several key problems in detecting the leaks.

本文从理论和实验两个方面分析了相关技术在石油输送管道泄漏检测中的可行性和优越性并探讨了检漏中需要解决的几个关键问题。

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17、

Fortunealso reported that richmont holdings was putting together a bid for the company.

《财富》杂志（Fortune）还报道，Richmont Holdings投资公司也加入了收购该公司的行列。

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18、

Richmont Mines, Inc. shares are currently trading off about 2.9% on the day.

股份有限公司Richmont矿业公司股价当日下跌约2.9%。

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19、

The problem is to get it all done in the time available.

问题是要在现有的时间内把它全部完成。

《牛津高阶英汉双解词典》

20、

It seems that the information society expands the quantity of information available to the members of a society by revolutionizing the ways of using and exchanging information.

信息社会似乎通过革新信息的使用和交换方式扩大了社会成员可获得的信息量。

四级真题- 2015年 12月 1卷短文填空