Three Ai Difficulty Levels 三艾困难水平
You can choose between three difficulty levels, once you finish a puzzle you can save it to your phone Library and enjoy it as a wallpaper!
您可以选择三个难度级别，一旦你完成一个难题，你可以把它保存到您的手机图书馆，并享受作为墙纸！
Three difficulty levels to choose from so anyone can play, whether you're a novice or veteran player.
三个难度级别选择所以任何人都可以玩，不管你是新手还是老将。
The second within-subject factor is difficulty, included three levels, easy, medium and difficult.
第二个因素是被试内变量，即阅读材料的难度，分为容易、中等、难三个水平。
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