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Scientists do not fully understand how anesthesia works, but the findings offers clues, as people with red hair have a certain genetic variant. 科學家們還不完全了解麻醉劑的作用機理，而這一發(fā)現(xiàn)為此提供了線索，因為紅頭發(fā)的人具有一種特定的遺傳性變型。