extrasn.附加物；号外；额外的人手；上品名词extra的复数形式.extrasphincteric fistula[医] 括约肌外瘘Extrasystolic arrhythmia期外收缩性心律失常extrasolar X-ray source太阳外X射线源extrasomatic rabbit heart离体兔心, 体外兔心extrasystolic quadrigeminy期前收缩性四联律Extraskeletal ossification骨骼外骨形成extrasolar planetary system太阳系外行星系Extrasynaptic NMDA receptor突触外NMDA受体extraskeletal calcification骨骼外钙化extraskeletal Ewing sarcoma骨外尤因肉瘤