"But with those six balloons, one is green,five are yellow or they may have three of them to be large and three of them to be smaller, or we may have one with a star on it.

VOA: standard.2010.08.10

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。

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