playback的解释回放,重放playback的例句Ondictationequipment,adeviceforaccuratealignmentofplaybackhead,orcombinedhead,tothetr ackontherecordingmedium.录音设备上的一种装置,它能精确地把重放磁头或组合磁头调准到记录介质的磁道上。Arelativelynarrowmagnetictapeusedtorecordsoundforsubsequentplayback.录音磁带一种相对狭长的磁带,用于录下声音以便日后重放