This study condition, main research results are as follows: 1the four world championships, the formation of aerobics in total quantity change has basically stable.
本研究条件下，获得主要研究结果如下：1四届世界竞技健美操锦标赛的队形变化在总数量上已经基本趋于稳定。
The change of labor productivity also can cause the change of the commodity supply and demand relations thus the total value quantity is changed.
同时，劳动生产率变化还会使商品供求关系变化，从而使价值总量发生变化。
It is the rate of change in total utility per unit change in quantity and is not the utility of a marginal unit.
它是（商品）量的每单位变动带来的总效用变动率，而不是边际单位的效用。
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