The essence stored in the kidney includes innate essence and acquired essence.

肾所藏的精气包括“先天之精”和“后天之精”。

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Concept of Inborn Qi: Motivation power of the vital activities of human body. It comes from the innate essence, and being nourished continuously by the acquired essence developed from food.

元气的概念：是人体生命活动的原始动力，由先天之精所化生，又受后天水谷之精气不断补充和培养。

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