单词	声线传播时间
释义	同射线传播时间--声线传播时间
随便看	instrument rolling bearing instrument room instrument runway instruments instruments-- core instrument screen instruments de cuivre instruments de cuivre {fr.} instrument security factor instrument-- self-reading instrument-- self-registering instrument sensing line instrument sensor check instrument servo mechanism instrument servomechanism instruments {fr.} instrument shelter instrument shunt instruments, indicating instruments, neutron instruments-- neutron instruments of credit instruments of music instruments of punishment instruments of punishment or of torture,