A real program would have a usage message and provide some sort of feedback if the user didn't specify at least one argument, but I've left that as an exercise for the reader.
一个真正的程序应该具有使用方法消息，并且在用户没有指定任何参数时，提供某种形式的反馈信息，但我把这项内容作为练习留给读者。
But this new real-time feature is meant for short-term usage if you're going to meet up with a friend, for example.
但是这种新的实时特点意味着短期使用，例如，你正准备与一位朋友会面。
But contrary to its usage as a content element, the image is used in web design as a medium to communicate a message to the user in order to create a certain context for the real content.
与案例1中的设计思想不同，这里照片是用来传达某种信息，为真正的内容创造上下文。
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