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...
They feel scared and powerless in conveyor-belt hospital wards.在千篇一律的病房里，他们感到恐惧而又无能为力。He was sympathetic, but powerless to help.他表示同情，但爱莫能助。When the enemy attacked, we were completely powerless against them.敌人进攻的时候，我们毫无抵...
引座员让我们在前排就座.The usher seated us in the front row.引座员让他们在前排就座.The usher seated them in the front row.引座员被告知要接待好听众并清点人数.The usher was told to look out into the audience and count noses....
The old man stood with his back to the fire, cresting up erect.老人背火昂然而立.Various shapes of returns like triangular, semi - circular are available for cresting your own office.极富创意的办公桌,有着不同形装如三角形、半圆形 、 曲尺形及四边形,以创造您个人品位的办公室...