For example, we will be able to direct only critical error messages to the log file (to save disk space), while still being able to print all of the log messages on the console.
例如，我们可以仅指示存储致命错误消息到日志文件(存储到硬盘)，然而仍然可以在控制台打印所有消息。
Is it an error if you print a document, only to find that no printers are connected?
如果你在打印一个文档，却发现没有连接打印机，这是个错误吗？
Is it an error if you print a document, only to find that no printers are connected?
如果你在打印一个文档，却发现没有连接打印机，这是个错误吗？
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