要，指内丹修炼的三大要点。分为外三要眼、耳、口和内三要精、炁、神。道教认为“九窍之邪，在乎三要”。“夫惟三要，有内三要，有外三要。内之三要者，精炁神也。外之三要者，眼耳口也。眼为神之门，耳为精之门，口为气之门
管理三要素 PMF
三要素法 three-factor method ; three-factor rule
三要素 Elements of color ; three essential elements ; Three Factors ; Price per unit
英语演讲环境的三要素 Principles of English Public Speaking
力的三要素 Three elements of force ; three factors of force
肥料三要素 three essence of fertilizer ; three essentials of fertilizer ; major three elements of fertilizer ; major fertilizer elements
泡沫三要素 foam triangle
三要素肥料 three major fertilizer
燃烧三要素 fire triangle
礼貌三要素 Ingredients of Courtesy
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