相关单词近义词 immature 不成熟的, small 小的, undersized 尺寸不足的, weak 弱的, unused 未用过的, unfledged 羽毛未丰的, infantile 婴儿的, developing 发展中的临近词under, underprop相似词undercook, undercover, undercurrent, undercut, underdog, underdone, underdressed, underemployed, 返回 underdeveloped