Knowledge parent, knowledge forms and knowledge transaction cost and so on are the factors affecting learning cost.
知识母体、知识的表现形式和知识交易费用等是影响学习成本的主要因素。
·2,447,543篇论文数据，部分数据来源于NoteExpress
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What's more, Brawley noted, it may be difficult for a teenager to seek help from a doctor or counselor without a parent's knowledge.
CNN: Teens have fewer aids for kicking the habit
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