The quantity theory of money suggests that the general price level of goods and services is directly proportional to the amount of money in circulation.
货币数量学说表明，商品和服务的总体价格水平与流通中的货币量成正比。
In the classroom, the quantity theory can be applied to suggest that more practice leads to better performance.
在课堂上，数量学说可以应用于建议更多的练习会导致更好的表现。