材质：木制。尺寸：80×60×3㎝。转动轮轴带动齿轮，风车转动起来。认识齿轮传动原理。
Material:Wood Size:80×60×3cm
Turn the wheel and drive the gear, the windmills seemed to be turned by
the wind. In addition to understanding the principle of gear drive, as well
as the circle fork chalet, let the kids interact with the games.
