Learnability hypothesis 可学性假设
pac learnability pac可学习
Teachability & Learnability 可教与好学
non-learnability 非可学性
language learnability 语言可学性
conjunctive rules learnability 合取规则可学习性
Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design?
可学习性：初次接触这个设计时，用户完成基本任务的难易程度。
Learnability also dictates that controller mappings should be consistent; if the X button is used for "yes" in one area of a game, it should always be used for confirmation throughout.
易学性还要求我们，控制的映射必须具有一致性；如果在游戏中的某个区域，X键代表的是“Yes”，那么它就应该由始至终的用来表示确定。
Learnability: the degree to which the code source of a system is easy to learn.
易学性：系统源代码易于学习的程度。
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