There are statutes about ship mortgage not only in civil law countries, but also in common law countries, and international society has codified related conventions.
不论英美法国家，还是大陆法国家，都有关于船舶抵押权的成文立法，国际社会也制订有相关的国际公约。
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Secondly, compared with mortgage system in commonlaw, there isn't proprietary right transferred in houses' mortgage in our country.