... Difficulty(难度,使用者完成学习的难度); Typical-Learning-Time(通常学习时间); Description(使用说明); ...
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Educational.Typical learning time: Approximate or typical time it takes to work with or through this learning object for the typical intended target audience.
Typical Learning Time：一般预期目标受众使用或完成该学习对象所花费的大约时间或通常时间。
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