三因有两种释义，一种是佛教名词，另一种是病因病理学名词，指古代三类病因的合称，即内因、外因、不内外因。
定义 中文名称：三因 英文名称：three types of disease causes 定义：内因、外因、不内外因的合称。现代中医学中很少用“不内外因”来归类，而将内因、外因之外的病因概括为“其他病因”。 应用学科： 中医药学（一级学科）； 中
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... three categories of self-restraint 三戒 three causes 三因 three causes and three effects 三因三果 ...
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三因素模型 three-factor model ; Fama-French Three-Factor Model
三因子试验设计 three factor design of experiment
三因子模型 Three-Factor Model ; Fama-French Three-factor Model
爱情三因论 triangular theory of love
三因素 Three-way ; Thee Factor Model
钢筋锈蚀三因素模型 three-factor model of bar corrosion
三因子交互影响 [计] triple interaction ; three-factor interaction
三因迪斯克公司 SanDisk Corporation
动力学三因子 kinetic triplet
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三个孩子因持续行为不检被学校开除。
Three children were removed from the school for persistent bad behaviour.
一些立法者主张对那些因严重罪行而两次服刑后又被判第三次严重罪行的人判处终身监禁。
Some legislators advocate mandating a sentence of life in prison for anyone who, having twice served sentences for serious crimes, is subsequently convicted of a third serious crime.
第三个来源，特别是在中纬度和高纬度地区，森林和土壤中因气候变暖而加剧的有机物腐烂，现在被认为具有潜在的重大意义。
A third sources, the warming-enhanced decay of organic matter in forests and soils, especially in the middle and higher latitudes, is now being recognized as potentially significant.
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