逐步升级 zhú bù shēng jí

DEFINITIONS

  1. escalation

CHARACTERS

逐 zhú
HSK 5
chase, expel; one by one
步 bù
HSK 2
step, pace; walk, stroll
升 shēng
HSK 5
arise, go up; hoist; advance
级 jí
HSK 3
level, rank, class; grade