derivativen.派生物；衍生字；导数adj.派生的；(贬)非独创的；庸乏的derivative noun派生名词derivative duty后发义务derivative tool衍生工具derivative weld引出焊derivative time微分时间derivative term派生词derivative verb派生动词derivative rock沉积岩,导生岩derivative call导数调用Derivative line衍生系