The serf owners considered serfs and slaves as their private property, so they could trade and transfer them, present them as gifts, make them mortgages for debts and exchange them.是什么意思_The serf owners considered serfs and slaves as their private property, so they could trade and transfer them, present them as gifts, make them mortgages for debts and exchange them.在线翻译_英语_读音_用法_例句