Positivesum game的用法和樣例：
例句
- A zero-sum game is a game in which the sum of the payoffs of all the players is zero whatever strategies they choose.
零和博弈是指在一個博弈中，無論每個參與人選擇什麼樣的策略，所有參與人的支付之和總是為零。 - In the introduction to this text the concept of the zero-sum game was proffered as the essence of international negotiations.
在本書的介紹部分已經將零和博弈作為國際談判的實質提了出來。
