Strutting violently about the room, he simulated a dynamic and irresistible efficiency.
他在房间里猛烈地昂首阔步， 表现出一种充满活力和不可抗拒的效率。
英语百科
Dynamic efficiency
In economics, dynamic efficiency is a situation where it is impossible to make one generation better off without making any other generation worse off. It is closely related to the notion of "golden rule of saving". In general, an economy will fail to be dynamically efficient if the real interest rate is below the growth rate of the economy (sum of the growth rates of population and per capita income).