《此事难知》浊气为卫·
浊者.体之下也.阴也.水也.坎中之阳升.子后一阳生.即肾阳举而使之.故曰浊气为卫.地之浊不升.地之清能升.能阳举而使之上也.天之清不降.天之浊能降.为六阴驱而使之下也.经曰.地气上为云.天气下为雨.雨出地气.云出天气.此之谓欤.
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