事先通知 shì xiān tōng zhī

DEFINITIONS

  1. preliminary notification
  2. to announce in advance

CHARACTERS

事 shì
HSK 2
affair, matter, business; to serve; accident, incident
先 xiān
HSK 1
first, former, previous
通 tōng
HSK 4
pass through, common, communicate
知 zhī
HSK 2
know, perceive, comprehend