词汇	announcer time
释义	announcer time 报时台
随便看	positive-sum Positivesum game positive summating potential positive supercharger positive supercoil positive supercoiling positive superhelix positive superhelix structure positive supply positive supply rail positive supply voltage positive supporting reflex positive surge positive switching barriers positive switch signal positive symmetrical characteristic positive symmetric operator Positive symmetric solution positive symmetry model positive symptom positive symptoms positive sync pulse positive system positive system of roots positive take-up