名詞 playback:

1. the act of reproducing recorded sound
2. electronic equipment comprising the part of a tape recorder that reproduces the recorded material

1. In word processing, an editing feature in which the system automatically adjusts the right hand margin for insertion or deletion of copy during playback. Word and sometimes page wraparound is automatically performed as needed.
   字(詞)處理技術(shù)中的一種編輯特性，在此特性下，系統(tǒng)在副本中插入或刪除后，右邊自動對齊。在需要時，系統(tǒng)自動完成卷字和卷頁。
2. A relatively wide magnetic tape used to record visual images and associated sound for subsequent playback or broadcasting.
   錄像磁帶一種比較寬的磁帶，用來記錄圖像和對應(yīng)的聲音以進(jìn)行復(fù)放或者播放
3. A relatively narrow magnetic tape used to record sound for subsequent playback.
   錄音磁帶一種相對狹長的磁帶，用于錄下聲音以便日后重放
4. On dictation equipment, a device for accurate alignment of playback head, or combined head, to the track on the recording medium.
   錄音設(shè)備上的一種裝置，它能精確地把重放磁頭或組合磁頭調(diào)準(zhǔn)到記錄介質(zhì)的磁道上。

play.back

n.（名詞）
The act or process of replaying a newly made record or tape.
重放：重放新錄制的唱片或磁帶的行為或過程
A method of or an apparatus for reproducing sound recordings:
重放錄音的方法或設(shè)備：
例句：
.switches on the playback of a telephone-answering machine.(Vanity Fair)
.電話回答裝置的重放鍵.(名利場)