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。
Laska has an integrated AI with three levels of difficulty.
拉斯卡有一个集成的AI三个级别的难度。
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