That's because the red light is actually not a gross constituent unit in a semiotic system, right?

那是因为红灯不是这一符号系统的一个主要组成单元，对吗？

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The first level consists of the performance object, which is a unit that can model a physical device or abstract component in a system.

第一级包括性能对象，它是可以为物理设备建模，或者抽象系统中组件的单元。

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