究其根源 jiū qí gēn yuán

DEFINITIONS

  1. to trace something to its source (idiom)

CHARACTERS

究 jiū
HSK 4
examine, investigate
其 qí
HSK 3
his, her, its, their; that
根 gēn
HSK 3
root, base(d on); foundation
源 yuán
HSK 5
spring; source, head; surname