秘密活動 mì mì huó dòng

DEFINITIONS

  1. clandestine activities
  2. covert operation

CHARACTERS

秘 mì
HSK 5
secret, mysterious, abstruse
密 mì
HSK 4
dense, thick, close; intimate
活 huó
HSK 4
live, exist, survive; lively
動 dòng move, happen; movement, action