求翻译：2 (τ, x∗τ )] is the instantaneous cooperative payoff and gi [τ, x∗τ, φ∗1 (τ, x∗τ ) , φ∗2 (τ, x∗τ )] is the instantaneous noncooperativepayoffs of Player i given that the state at time τ is x∗τ∈ X∗τ.是什么意思？