wing clearance lights 机翼宽度灯
Such as lighting design should be based illumination and middle-illumination, can not use "long lights, " pick to be opened, as-you-go clearance, to avoid the temperature increased in the cave;
如照明设计应以低照度和中等照度为主，不能使用“长命灯”，必须随到随开，随走随关，避免洞穴温度过高；
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