Therefore , it should be based on the couple 's property contract , different from the ordinary contract , which specifically lies in : The subject who signs the contract is irreplacable ;
同时，这种财产制度又是以婚姻关系为前提的。这就决定了夫妻双方对财产的约定具有不同一般契约理论的特殊性，具体表现为：订立契约的主体具有不可替代性；
irreplacable