instancy speed瞬时速度
instancy aspect瞬时体
instancy-quantity瞬时量
exigence exigency instancy urgency紧急
necessity and instancy必要性和紧迫性
"the instancy of modern communication"
同义词：immediacyimmediatenessinstantaneousness
"he pressed his demand with considerable instancy"
同义词：imperativeness
N（名词） the quality of being urgent or imminent 急迫性; 迫切性