而软件，即指令电脑从事何种工作的编程，可以电子方式进行生产、配送和营销，因此，其边际成本趋于零。
Software — the programming that tells computers what to do — can be marketed, manufactured, and distributed electronically, giving it a marginal cost that is close to zero.
经微型 电子摄像头的摄取并经微电脑确认，做出各种相应的提示指令，来完 成盲人日常生活中各种识物引导工作。
The orders are caught by the micro-electric CAM, assured by the micro-computer and then used to guide the reading of the blind men.
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