务必

務必
wùbì
  1. must
  2. to need to
  3. to be sure to

CEDICT

Entry Composition

1 务 wù
  1. affair
  2. business
  3. matter
  4. to be engaged in
  5. to attend to
  6. by all means
2 必 bì
  1. certainly
  2. must
  3. will
  4. necessarily