短语词组短語LEN LENGTHEN 直線拉長;長度調整LENGTHEN LK 拉長線段lengthen v 延長can lengthen 可延長LRN LENGTHEN 長度lengthen symbol [計]加長符號;繙譯lengthen n 延長;伸長limb lengthen 肢躰延長lengthen out 過分延長 返回 lengthen