2. Your press kit , or media kit, is an
invaluable tool you can use to promote your company.
你的宣传资料袋,或媒体资料袋,都是你可以用来宣传公司的宝贵的工具。
3. Even when a client is connected, server-side log messages are
invaluable for debugging and monitoring the application.
当有客户端连接上了,服务器端的日志信息对于调试和监控应用也是无用的。