这四个方程中，引导中心相空间连续方程是基本方程，刘维定理则是核心。

Of the four equations the basic equation is the continuum equation of phase space for the guiding center which has its root in the Liouville's theorem.

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本文从刘维定理出发，通过相空间求平均，建立了中子星吸积柱中粒子流连续方程和动量迁移方程。

In this paper we establish a set of kinetic equations from Liouville's theorem which can be used to describe the charged particle distribution in the accretion column of a neutron star.

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