但那需要在每次运行后观察程序的输出来判断是否有错误。

But that requires inspection of the program's output after each run to determine if an error occurred.

youdao

尽管这是一个很简单的示例，但它演示了通过应用程序跟踪可以观察程序内部机制的程度。

Although this is a simple example, it illustrates the degree of transparency enjoyed through application tracing.

youdao

您可以使用其中最重要的功能（即调试器）来观察程序的运行时行为，并确定语法错误的位置。

You can use the most important of these, the debugger, to observe the run-time behavior of your program and to determine the location of semantic errors.

youdao