However,defensive warfare,which is passive in form,can be active in content,and can be switched from the stage in which it is passive in form to the stage in which it is active both in form and in content.

• 然而，防御战是能够在被动的形式中具有主动的内容的，是能够由形式上的被动阶段转入形式上内容上的主动阶段的。