extrasn.附加物；号外；额外的人手；上品名词extra的复数形式.extrasuper-duralminn.特超杜拉铝extraspectral magenta光谱外品红extrastoles in salvos礼炮齐鸣样期前收缩extrasystole of atrium房性期外收缩extrasystolic bigeminy期前收缩性二联律extraseasonal fruiting季节外结果extrastimulus technique额外剌激技术extrasensory perceptionn.超感知觉extrasample performance超样本特性extraseasonal prediction跨季度气候预测