proper的名词是什么

名词是property，中文意思是n.

所有物;财产;财物;不动产;房地产;房屋及院落;庄园;性质;

例句

Two people who exchange property voluntarily are both better off or they wouldn't do it.

两个人自愿地交换所有物是互惠互利的，否则他们将不那么做。