Syon西翁SYabbr.平方码(=square yard)abbr.主发动机偏转(=sustainer yaw)syringaresinoln.丁香树脂醇Sylvian artery[医] 西耳维厄斯氏动脉, 大脑中动脉Syringa leaves紫丁香叶Syles' Warblersyringoadenoma汗腺腺瘤syphilographer[医] 梅毒论作者Syrastrenopsisn.拟痕枯叶蛾属systolic index(心脏)收缩指数sylvestre soil森林土systolic array心动阵列