Position of light | 光的位置
A light bulb is both a light source and a switch,
This lamp has no buttons, but it has three gears,
If you want it to shine a lot, just put the elf bulb in,
On the pit of the corresponding gear,
the bulb will emit the brightness of the corresponding gear.
灯泡既是发光体，也是开关，
这个台灯没有按键，却有3个档位，
如果你想要它发出多亮的光芒，就将精灵造型的灯泡放在，
对应档位的坑上，灯泡就会散发对应档位的亮度。
