短语词组短语LEN LENGTHEN 直线拉长;长度调整LENGTHEN LK 拉长线段lengthen v 延长can lengthen 可延长LRN LENGTHEN 长度lengthen symbol [计]加长符号;翻译lengthen n 延长;伸长limb lengthen 肢体延长lengthen out 过分延长 返回 lengthen