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первопричина n stresses
gen.	基; 基因; 宿根 (настоящего существования); 由缘; 本原; 远因; 元因; 源头; 主要原因; 首要原因
el.	起源; 源; 电源; 水源
relig., rel., budd.	本缘
tech.	基本原因

первопричина: 3 phrases in 3 subjects

Figure of speech	1
General	1
Medical	1