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