ex·i·gen·cy /ˈɛksəʤən(t)si, ɪgˈzɪʤən(t)-/
  緊急,急迫,苛求,緊急事件
  Ex·i·gen·cy n.; pl. Exigencies   The state of being exigent; urgent or exacting want; pressing necessity or distress; need; a case demanding immediate action, supply, or remedy; as, an unforeseen exigency. “The present exigency of his affairs.”
  Syn: -- Demand; urgency; distress; pressure; emergency; necessity; crisis.
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  exigency
       n 1: a pressing or urgent situation; "the health-care exigency"
       2: a sudden unforeseen crisis (usually involving danger) that
          requires immediate action; "he never knew what to do in an
          emergency" [syn: emergency, pinch]