根源

gēnyuán
  1. origin
  2. root (cause)

CEDICT

Entry Composition

1 根 gēn
  1. root
  2. basis
  3. classifier for long slender objects, e.g. cigarettes, guitar strings
  4. radical (chemistry)

classifier: 條
2 源 yuán
  1. root
  2. source
  3. origin