基本解释正平衡点同根派生 extiction相关词英汉例句Keywords Impulsive differential equation;discrete population dynamical system;stroboscopic map;global stability;extiction;permanence;complexity; 脉冲徽分方程;离散种群动力系统;频闪映射;全局稳定性;灭绝;持续生存;复杂性;extiction更多例句