这个原理声称一个类的设计者和这个类的使用者，共同分享关于类的实现的假设。
This principle asserts that the designer of a class and the user of that class share assumptions about the class implementation.
当然首先是硬件和软件工程师，他们是实时嵌入式系统的提出者、设计者、实现者和测试者。
There were first, of course, the many hardware and software engineers who envision, design, implement, and test embedded realtime systems.
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