摘要
In our previous paper （Kexue Tongbao, 28 （1983）, 12: 740）, we advanced a new point of view and a new method （i.e. a many-shell model that divides shells according to the ρi2-（Vi-V0）2 figure）. We took them to explain the distribution figure of the character velocity region of the M-type supergiant maser source, and we are convinced that their use could be more general. This
