您必须在免费软件的基础上付出一定的劳动来设计和实现系统，就好象您在开发专有软件时所必须做的工作一样。
You must accept a certain amount of work to design and implement systems based on free software, just as you must do when evaluating proprietary software.
例如，德克萨斯小桥的结构梁是定制设计，并用劳动密集型的方法建造的。
The beams for the Texas bridge, for example, were custom designed and built using a labor-intensive method.
通常来说，为了设计和构建可重用有价值的服务，你必须持续测试和评估你的劳动成果、度量质量、不断学习和重构。
In general you have to continuously test and evaluate you efforts, measure quality, learn, learn more and refractor for designing and building reusable and valuable services.
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