最高阶导数线性地出现的那种方程是准线性方程.A quasilinear equation is one in which the highest - order derivative appears linearly.这种 “ 导数边界条件 ” 的规定描述于 3-5 节中.The specification of such " derivative boundary conditions " is described in Sectio...
他送给女友一枚镶着蓝宝石的订婚戒指。He gave his girlfriend a sapphire engagement ring.现在让我们考虑象钻石和蓝宝石这样的晶体.Now let us consider crystals such as diamond or sapphire.现在让我们考虑象金刚石和蓝宝石这样的晶体.Now let us consider crystals such as diamond or sopphi...
It was certainly useful to have her there to chauffeur him around.有她在那儿还是挺有用的，能开车带他到处跑。He wrested the suitcase from the chauffeur.他从司机手里抢过手提箱。a long black chauffeur-driven limousine由专职司机驾驶的黑色豪华加长轿车...