逆流溯源 nì liú sù yuán

DEFINITIONS

  1. to go back to the source

CHARACTERS

逆 nì
HSK 6
disobey, rebel; rebel, traitor
流 liú
HSK 4
flow, circulate, drift; class
溯 sù go upstream, go against current; formerly
源 yuán
HSK 5
spring; source, head; surname