I added statements to print to standard out, but why not use a more sophisticated logging mechanism to keep track of which files have been uploaded and when?
我增加了打印到标准输出的语句，但是为什么不采用一个更加成熟的日志机制来记录文件上载的时间和地点？
2
By calling print you trigger the mechanism to send your content to the print service in a separate thread.
通过调用print，您触发了一个机制，该机制在一个单独的线程中向打印服务发送内容。
3
If you offer more detailed print literature, provide a mechanism for site visitors to request it.