annulv.废除；消减；取消；宣告无效annulus urethralis尿道环annulus conjecture圆环猜想Annuli chartacters年轮特征annul an agreement取消协议annulus tympanicus[医] 鼓环annulus tendinosus前弹力层周边环, 环状韧带annulus trachealis气管环annulus antennalis围角片annulospiral ending螺旋环终末,环螺形末梢annulus occipitalis枕(骨)环