There are always three lights: red, yellow and green. Red means "Stop".

始终有三种灯：红，黄绿。红灯意思是停。

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There are four sides, and each side has three lights: red, yellow and green.

灯有四面，每一面都有三盏灯：红、黄、绿。

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There are four sides, and each side has three lights: red, yellow and green.

灯有四面，每一面都有三盏灯：红、黄、绿。

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