n.延伸，延长部分；拓展； 变形： 复数：prolongations 英英释义： prolongation[ ,prəulɔŋ'ɡeiʃən ]n.the act of prolonging something"there was an indefinite prolongation of the peace talks"同义词：protractionperpetuationlengtheningamount or degree or range to which something extends同义词