a turning or tilting backward of an organ or body part
同义词：retroversion??/??retroflexion
an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth
同义词：retroflexion
the act of bending backward
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。