Arrange various sized stones into families, draw a watermelon and you have watermelon-chess. Lessons are like play and this one is for physical education.

 
  • 几颗不同样子的大小石头排起来,分成两家,画上一个大西瓜,就可以玩西瓜棋了。上课如游戏,这堂上体育。
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