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Sentence

原げん因いんはいまだにわかっていない。

Span Details

原げん因いん

cause; origin; source

noun, suru verb

いまだに

still; even now; to this day

-> 未だにadverb

understand; comprehend; grasp

-> 分かるgodan verb, interjection

ongoing or resultant state

-> ているgrammar

negative auxiliary