素因

そいん

Common word

noun, no-adjective

basic factor

(medical) predisposition, diathesis

素	elementary, principle, naked, uncovered
因	cause, factor, be associated with, depend on, be limited to

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にんげん

きょうつう

しゅくめい

そいん

、

、

じん

かぎ

This is a basic factor that can even be said to be the common lot of man, it certainly doesn't apply only to Germans