根源 source; origin; grass roots; root; fountain; fountainhead; radix; bottom 社会根源 social roots; 思想根源 ideological root-cause; 历史根源 historical roots; 它的根源在于嫉妒。 it has its source in envy [jealousy]. 不注意清洁是各种疾病的根源。 uncleanliness is the root of various diseases