利昂娜将一些清洁剂放入洗碗机,关上门后按了开始键。Leona put some detergent into the dishwasher, shut the door and pressed the switch.利昂娜: 怎么会是? 他们逃跑了马?Leona : what happened ? Did they get away?乔: 妮有什么主意吗, 利昂娜?Joe: have you got any ideas, Leona?...
绝大多数非线性微分方程是不能用解析方法求解的.The overwhelming majority of nonlinear differential equations are not soluble analytically.与微分相反的运算叫做积分.The operation that is the inverse of differentiation is called integration.这称为正规微分方程组.This is...