俯视油灯的视角结合“20”周年将油灯与灯芯巧妙的组合，无论在30年、40年、甚至50年，只要改变灯芯线的摆放就能一直沿用。

It is a top view of an oil lamp and its wick combining with the number of “20”. No matter in the year of the 20th anniversary, the 30th, the 40th, or the 50th, the logo can be used as long as replacing the lamp wick.