It's going to mean a strategy choice for everybody except person "i."

它表示除了i外其参与人的策略

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So rational choice in this case, people not choosing a dominated strategy; people choosing a dominant rational choice can lead to outcomes that - what do Americans call this?--that "Suck."

理性的选择,即本案例中人们不去选择劣势策略,反而选择优势策略,使总结果变得,美国人怎么说的,"糟糕"

耶鲁公开课 - 博弈论课程节选