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We present a result on uniform attractivity of the origin for nonlinear time-varying systems. Our theorem generalizes Matrosov's theorem which extends, in a certain manner, Krasovskii-LaSalle's invariance principle to the case of general nonlinear time-varying systems. We show the utility of our theorem by analyzing uniform asymptotic stability of the origin for nonholonomic: systems in closed loop with particular smooth time-varying feedbacks previously proposed in the literature.