程序执行语句 program execution statement 规划的并行执行 parallel execution of plans 非执行语句标号 nonexecutable statement label .
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If the CANCEL statement names a program that is active to any thread, the execution fails.
如果cancel语句指定了一个程序，并且该程序对于任意线程都是活跃的，那么执行将失败。
The die statement halts program execution and displays text to the Web browser.
die语句会中止程序执行，并在Web浏览器上显示文本。
We wrap everything we do in an eval statement, since we don't want our program to die when an error occurs during execution.
因为不希望程序在出现执行错误时终止，所以将所有操作放在 eval 语句中。
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