A right of retention created by agreement allows a party whose contractual partner is in breach of contract to withhold its own performance and, in particular, an asset which under the terms of the contract the withholding party is obliged to deliver to the party in breach.
由约定产生的留置权允许一方当事人在其合同伙伴违约时暂停履约，尤其是留置根据合同规定留置方有义务向违约方交付的资产。