pro·lon·ga·tion /ˌprəʊlɒŋˈɡeɪʃən $ ˌproʊlɒːŋ-/ noun 1 [singular, uncountableU]LONG TIME the act of making something last longer 延长,拉长;拖延prolongation of the prolongation of life 延长生命
2. [countableC]LONG something added to another thing which makes it longer 增加[延长]的部分