视频点播服务质量可参照话音服务，按信号阻塞或服务无效性来表示。
VOD service quality can, as for telephony, be expressed in terms of blocking or service unavailability.
HCL科技公司是一家软件公司，它帮助客户升级电脑系统，承诺如果服务无效，客户无需付款。
HCL Technologies, a software firm, helps clients improve their IT systems on the understanding that if they reap no benefits, they pay nothing.
否则，可能遇到各种错误，比如服务器概要文件包含无效的连接概要文件引用，或者部署组包含无效的部署工件引用。
Otherwise, you may see various errors such as Server Profiles that contain invalid references to connection profiles or Deployment Groups that contain invalid references to deployment artifacts.
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