并发性：并发执行目标的线程数。

Concurrency: the number of threads concurrently executing the target.

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验证和执行目标环境任务。

Validating and Executing the Target Environment tasks.

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您可以手动设置变量的数据以确保能够正确执行目标。

You can set the data of the variables manually to assure that the target is correctly executed.

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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