re·in·sur·ance /ˌriənˈʃʊrən(t)s ||(ˌ)riˈɪnˌ/
  再保險,再保險金額
  Re·in·sur·ance n.
  1. Insurance a second time or again; renewed insurance.
  2. A contract by which an insurer is insured wholly or in part against the risk he has incurred in insuring somebody else. See Reassurance.
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  reinsurance
       n : sharing the risk by insurance companies; part or all of the
           insurer's risk is assumed by other companies in return
           for part of the premium paid by the insured; "reinsurance
           enables a client to get coverage that would be too great
           for any one company to assume"