We introduce the concept of time-variable directional field, and establish the stable and unstable theorems by the qualitative method.
引入了时变方向场的概念，用定性方法建立了稳定及不稳的定理。
We introduce the concept of time-variable directional field, and establish the stable and unstable theorems by the qualitative method.
引入了时变方向场的概念，用定性方法建立了稳定及不稳的定理。
应用推荐