无法提供服务 meaning in English

service not available
service unavailable

When the portal server is not available , the general error page displays , as shown in figure 7
当门户服务器无法提供服务时，将显示一般的错误页面，如图7所示。
The server is temporarily unable to service your request due to maintenance downtime or capacity problems . please try again later
服务器暂时无法提供服务，由于你的要求停用或维修能力的问题。请稍后再尝试。
The vulnerability could allow a malicious user to slow a web server s response or prevent it from providing service altogether for a period of time
此缺失让怀有恶意的使用者能够在一段时间内拖慢web伺服器的反应或使其完全无法提供服务。
Companies hire email marketing firms to run their email strategies because traditional agencies are unable to provide the quality of service and necessary technology that email pure - plays provide
因为传统代理商无法提供服务质量喝必要的技术，而这些只有专业公司才能做到，故很多公司都是雇佣专业电邮营销公司来营运自己的电邮策略。