封装指的是使对象成为黑箱的概念，这样当使用对象时就不知道它的内部工作原理。
Encapsulation refers to the concept of making an object a black box, so that when you use that object you do not know its internal workings.
本文在分析了安全系统软件的安全性和风险度量概念的基础上，详细讨论了黑箱条件下的软件风险度量等问题。
After analyzing the software risk concept of safety-critical system and metrics definition of software risk, this paper discusses metrics definition of software risk based on black-box.
本文在分析了安全系统软件的安全性和风险度量概念的基础上，详细讨论了黑箱条件下的软件风险度量等问题。
After analyzing the software risk concept of safety-critical system and metrics definition of software risk, this paper discusses metrics definition of software risk based on black-box.
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