Flip Scorekeeper

这是一个很巧妙的计数器，无需齿轮、电池和复杂的结构，你可以研究一下，很有意思的模型。It's a very ingenious counter, without gears, batteries and complicated structures, you can look into it, very interesting model.往后翻转就可以让当前数字加一，往前就可以让当前数字减一，具体效果可以参考下面的视频。Flip backward to add one to the current number, and forward to subtract one from the current number, as you can refer to the video below.然后你可以通过计数器的底部预留的孔位连接多个计数器，就可以做到两位数、三位数的计数，适应的场景会更广泛。还可以分别打印出红色数字和蓝色数字，分别为红队和蓝队记分。Then you can connect multiple counters through the holes reserved