至关重要

至關重要
zhìguānzhòngyào
  1. extremely important
  2. vital
  3. crucial
  4. essential

CEDICT

Entry Composition

1 至 zhì
  1. to arrive
  2. most
  3. to
  4. until
2 关 guān
  1. mountain pass
  2. to close; to shut; to turn off
  3. to confine; to lock (sb) up; to shut (sb in a room, a bird in a cage etc)
  4. to concern; to involve
3 重要 zhòngyào important; significant; major