As Adam Smith observed: "the propensity to truck, barter and exchange one thing for another is common to all men, and to be found in no other race of animals."

正如亚当·斯密指出的：以物易物，物物交换是人类共同的习性。这种习性，未曾在其他动物身上有所发现。

youdao

As Adam Smith observed: "the propensity to truck, barter and exchange one thing for another is common to all men, and to be found in no other race of animals."

正如亚当·斯密指出的：以物易物，物物交换是人类共同的习性。这种习性，未曾在其他动物身上有所发现。

youdao