通暢

通畅
tōngchàng
  1. unobstructed; clear
  2. (of writing or thinking) coherent; fluent

CEDICT

Entry Composition

1 通 tōng
  1. to go through
  2. to know well
  3. (suffix) expert
  4. to connect
  5. to communicate
  6. open
  7. to clear
  8. classifier for letters, telegrams, phone calls etc
2 暢 chàng
  1. free
  2. unimpeded
  3. smooth
  4. at ease
  5. free from worry
  6. fluent