有时会将诊断信息打印到屏幕上，帮助调试。

There are also a number of points where diagnostic information is printed to the screen to help in debugging.

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args “函数负责确保我们接收到正确数量的命令行自变量，它还负责打印有帮助的用法信息。”

The "args" function takes care of making sure that we receive the correct number of command-line arguments, and also handles printing helpful usage information.

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赋值给faul t属性的trace方法会把给定的信息打印到控制台，从而帮助您调试任何可能发生的问题。

The trace method assigned to the fault attribute prints the given message out to the console, which helps you debug any issues that might occur.

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