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。
On each side of the screen is a small camera surrounded by tiny infrared lights.
萤幕两侧各有一台小型摄影机，摄影机旁边则围绕著小小的红外线灯。
On each side of the screen is a small camera surrounded by tiny infrared lights.
萤幕两侧各有一台小型摄影机，摄影机旁边则围绕著小小的红外线灯。
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