A Necessary and Sufficient Condition of the Existence and Uniquence of the Limit Cycles for a Class of Prey-Predator System with Sparssing Effect是什么意思_A Necessary and Sufficient Condition of the Existence and Uniquence of the Limit Cycles for a Class of Prey-Predator System with Sparssing Effect在线翻译_英语_读音_用法_例句