防空警报 fáng kōng jǐng bào

DEFINITIONS

  1. air raid siren; an alert or warning system to notify people of impending aerial attacks

CHARACTERS

防 fáng
HSK 5
defend; prevent; embankment
空 kōng
HSK 3
empty, hollow, bare, deserted
警 jǐng
HSK 4
guard, watch; alert, alarm
报 bào
HSK 2
report, tell, announce