中文说明：若系统中有信息不完全或不确知的现象，则称为系统的灰色性。这种具有灰色性的系统，称为灰色系统。-If the system has incomplete information or not sure, then known as the system of the gray. This kind of gray system, known as the Gray system.
English Description：
If the system has incomplete information or not sure, then known as the system of the gray. This kind of gray system, known as the Gray system.