Now you know that when an error occurs, the application must clearly and succinctly explain to the user what went wrong, where the error occurred, and how to fix it.
现在您了解了错误是在什么时候发生的，应用程序必须明确而简洁地为用户解释出错原因、出错位置以及改正方法。
You know only what any user has to do to use the service and what any provider must do when implementing it.
您只是知道有些用户将会使用服务，以及提供商在执行服务时必须使用它。
Unfortunately, it won't work as a filter because it does not know how to handle the arguments that a CUPS filter must handle, namely, job id, user, job title, number of copies, and job options.
不幸的是，它不能作为过滤器工作，因为它不知道如何处理CUPS过滤器必须处理的参数：作业id、用户、作业标题、拷贝数量和作业选项。
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