These three lights with their respective colors just do positively mean these things.

三种颜色的灯和它们各自的颜色,自然的有各自表达的意思。

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Now in a stoplight, it only has three, one is tempted to say, variables plainly differing from each other: red, yellow and green we have two ways of thinking about the red light.

交通灯，三种灯，红黄绿，它们的颜色和彼此不能,我们有两种方式认识红灯的意思。

耶鲁公开课 - 文学理论导论课程节选