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...
All nature loafs, while man alone works for a living.世间的万物都在悠闲中过日子, 只有人类为生活而工作着.Loafs, is central subject, is the life goal.游荡, 是中心主题, 是人生目标.He loafs through life without any concerns.他浑浑噩噩过了一辈子,什么也不关心....
Many of Kuwait's spacious freeways were engineered by W S Atkins.科威特有很多宽阔的高速公路是阿特金斯集团设计建造的。Los Angeles is famous for its many freeways.洛杉矶以其众多的高速公路闻名.About 25 miles per gallon on the freeways.走高速公路的话,一加仑可以跑25英里....