警戒 [ㄐㄧㄥˇ ㄐㄧㄝˋ; jing3 jie4]
  to warn
  to be alert for
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  警戒
  けいかい
  noun (common) (futsuumeishi)
  nouns which may take the genitive case particle `no'
  vigilance
  precaution
  watch
  lookout
  alertness
  noun or participle which takes the aux. verb suru
  to be vigilant
  to be cautious
  to guard (against)
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