通常该处没有解释的时候,参见规范的定义部分
见第21条,定义
b) "Sidelights" means a green light on the starboard side and a red light on the port side each showing an unbroken light over an arc of the horizon of 112.5° and so fixed as to show the light from right ahead to 22.5° abaft the beam on its respective side.
也就是一个绿灯和一个红灯