Further, general measures need not be continuous or smooth: they need not be defined by a volume form, or more formally, their Radon–Nikodym derivative with respect to a given volume form need not be absolutely continuous.
进一步，一般的测度不必连续或光滑，他们不必由体积形式定义；或更形式地说，关于一个体积形式的Radon-Nikodym导数不必绝对连续。