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http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-001-structure-and-interpretation-of-computer-programs-spring-2005/video-lectures/1b-procedures-and-processes-substitution-model/
您即将离开知乎,请注意您的帐号和财产安全。
http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-001-structure-and-interpretation-of-computer-programs-spring-2005/video-lectures/1b-procedures-and-processes-substitution-model/