surety bond　

surety bond　担保债券，银行保证书　

Formally and legally enforceable contract among a first party（the principal or obligor），a second party（the customer or obligee），and a third party（the surety，such as a bank，bonding company，or insurance company）whereby the surety guarantees payment of a specified maximum sum，or to otherwise compensate（indemnify），the obligee against damage or loss caused by the actions（or a failure to perform）of the obligor.