Syon西翁SYabbr.平方码(=square yard)abbr.主发动机偏转(=sustainer yaw)systolic click[医] 收缩期卡塔音syzygy theorem合系定理syphon casting弯管sysematizationn.系统化(分类)Syllisgracilisn.叉毛裂虫syllabic group音组Sylvian valley[医] 西耳维厄斯氏谷, 大脑外侧谷Syzygium howiin.万宁蒲桃syringiectasia汗管扩张症systolic bruit[医] 收缩期杂音