elongation/ˌi:lɔŋˈgeɪʃn; ?@ -lɔ:ŋ-; ˌilɔŋ`ɡeʃən/ n(a) [U]making or becoming longer 拉长; 伸长; 延长.(b) [C] thing that has been made longer (esp a line in a drawing, etc) 被拉长之物（尤指绘图中的线等）.
牛津英汉双解词典