在任何一个社会都存在着社会弱者阶层或群体。
We know, and all exist society weak person stratum of colony in any society.
而在任何一个社会，都存在中、低收入阶层，特别是贫困阶层。
In any society, both of medium and low-income people exist, particularly those poor people.
在任何一个以商品交换为基础的社会中，它都是不可或缺的。
In the society that based on the exchange of the merchandise, it is necessary.
在任何一个以商品交换为基础的社会中，它都是不可或缺的。
In the society that based on the exchange of the merchandise, it is necessary.
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