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...
门厅里到处乱扔着玩具和雨靴。The entrance hall is littered with toys and wellington boots.我找到了他那件夹克衫，就在门厅里挂着。I found his jacket, which was hanging up in the hallway.大理石门厅通往起居室。A marble entrance hall leads to a sitting room....
She was a bridesmaid at the wedding.她在婚礼上担任女傧相.I was bridesmaid to Cathy.我当卡西的女傧相.But first a toast to Amily : always the bridesmaid, never the bride.不过,首先,我要 敬艾米丽,永远是伴娘, 从来也不做新娘....