词汇	cross derivative
释义	cross derivative 交叉导数
随便看	existing project corporation Existing Property existing provision existing public building existing public buildings existing quality television existing-quality television existing quantifier existing question existing questions existing questions in existence existing railroad existing railway existing-railway existing railway bridge existing railway concrete bridge Existing railway curve line existing railway line existing railway lines existing railways existing-railway speed-raising existing railway station existing railway steel bridges existing railway surveys existing rate