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.
第三部分为黑箱在中学物理教学中应用的理论思考，通过对黑箱特点的分析，阐述黑箱在中学物理教学中的教育价值和应用的原则。
In the third part, pondering for the teaching's theory about black box in senior teaching physics, I propose educational value of black-box in the middle school physics teaching.
此外，这种四端口法还可用于某些四端口“黑箱”的分析之中。
The method can also be used for analysis of certain four-port "Black Boxes" .
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