Since each element in a level of decomposition is considered from the black box perspective only, the only interactions shown are those between them and the systems actors.
由于一个分解级别中的每一个元素都是从黑盒的角度被考虑的，所以显示出来的只是它们同系统参与者之间的交互作用。
At any given level of decomposition, there is a set of logical system elements considered from a black box perspective.
在任何给定的分解层级上，都有一组从黑盒角度考虑的逻辑系统元素。
The "TV control interface" occurs in a white box expansion at this level of decomposition, and thus is treated as a black box.
“电视控制接口”就被视作一个黑盒来处理。
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