单词	示踪剂
释义	示踪剂 shìzōngjì〔phy.〕tracer
随便看	universal cardan joint universal cardiovascular system universal card read-in program universal card slot universal carrier universal carrier recovery loop universal carrying network universal case opener universal cassette holder universal C clip universal C-clip universal center block universal center bolt nut and cotter universal center pin universal center type grinder universal centertype grinding machine universal center type grinding machine universal centre pin universal centretype grinding machine universal centre-type grinding machine universal chain universal chain control universal change over switch universal change-over switch universal character