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趣味编程专题：编程猫-捕鱼达人-呆鲤鱼碰到边缘就反弹-设置变量
理解“变量”积木的含义并掌握“变量”积木的基本用法。
趣味编程专题：编程猫图形化设计22/31
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App01:27理解“变量”积木的含义并掌握“变量”积木的基本用法。
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