比较源和目标执行产生的输出。

Comparing the Output Generated by the Source and Target executions.

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规则表达式中使用的语法高度依赖于目标执行环境。

The syntax used in rule expressions statements is highly dependent on the target execution environments.

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接下来，我们绘制序列流，显示至此为止的目标执行流。

Then we draw the Sequence Flows to show the intended flow of execution so far.

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So we want to write programs to do that.

为了实现这一目标我们要去写一个执行程序。

麻省理工公开课 - 计算机科学及编程导论课程节选