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The Context level treats the entire system as a single entity: a black box.
环境级别将整个系统视为一个单一的实体：黑盒子。
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A use case takes a "black box" approach to the system.
用例采用“黑盒”接近这个系统。
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A use case takes a "black box" approach to the system.
用例采用“黑盒”接近这个系统。
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