stillness       
noun [ U ] uk/ˈstɪl.nəs/ us/ˈstɪl.nəs/
 静止不动
total lack of movement or changing of position
  They gazed into the stillness of the water.  他们凝视着寂静的水面。 
 Something about her stillness, her absolute focus, calmed me.  她的静止,她的绝对专注,让我感到平静。 
 Synonyms: hush still
 - More examples
 - He was crouched in total stillness to photograph the animals.
 - Her dance included moments of stillness.
 - They stood in utter stillness.