Rain energy and gravitational potential energy were original energies of rocky desertification form in nature ecosystem, and were direct or primary motivity.
石漠化形成的主要原动力是自然生态系统的雨水动能和重力势能，亦是其形成的直接动力或第一性动力。
The primary objective of the present work is to reveal some physical phenoma about thermal drive under centrifugal field, or combined gravitational and centrifugal fields.
本文目的是研究离心力场及离心力场和重力场同时存在时热驱动流的一些现象和规律。
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