"Today the nature of the game showed how strong we were at the back, and that was a very good thing for the team.

VOA: standard.2009.10.17

Strategic substitutes is a strategy, is a statement about the nature of the game.

策略替代是一种策略,这是对于博弈性质的一种描述

耶鲁公开课 - 博弈论课程节选