There are hundreds of thousands of pieces of content representing thousands of learning hours which are freely available in repositories all over the world.
在世界各地各个知识宝库，存放几十万件内容，可自由获取，用于数千个小时的学习。
NOTE: the table is only a reference for learners in non-Chinese speaking countries and self-study time is included in the learning hours.
备注：以上学习时数，包含自学时间，适合非华语地区学习者。
NOTE: the table is only a reference for learners in non-Chinese speaking countries and self-study time is included in the learning hours.
备注：以上学习时数，包含自学时间，适合非华语地区学习者。
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