nonstationary       
adjective (also non-stationary) uk/ˌnɒnˈsteɪ.ʃən.ər.i/ us/ˌnɑːnˈsteɪ.ʃə.ner.i/
 非静止的,变动的
moving or changing rather than staying still
  We are operating in a nonstationary but stable environment.
 The shape of the graph will change when inflation is non-stationary. 当通货膨胀处于非静止状态时,图表的形状会发生变化。 
 - More examples
 - We have created both a stationary and a nonstationary version of the model.
 - He argues that the world is non-stationary and unstructured, so we cannot always predict what will happen.
 - They studied comets, asteroids, meteors, and nonstationary stars.
 - Astronomers think that this phenomenon may be responsible for non-stationary magnetic fields.