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你好，我是媽爹講故事裡最喜歡理性思考跟科學分析的鳥媽！
今天鳥媽要來考考你，當你在過馬路的時候，得看一個東西的臉色才知道你能不能過馬路，你知道它是什麼嗎？哈哈哈哈～答對了！它就是紅綠燈！
為什麼是看他的臉色呢？因為紅燈停、綠燈行啊！也就是說當紅燈亮起來你就要停下來，當綠燈亮起來時你才可以走。不過，鳥媽想問小耳朵們，為什麼紅綠燈是紅黃綠三種顏色呢？
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