Slow variation in the pitch of a sound reproduction resulting from variations in the speed of the recording or reproducing equipment. 音符失真，聲音走音由於錄音或放聲裝置中速度的變化而引起的，在放聲中出現的較慢的音調變化
The petitioner ask for a variation in her maintenance order. 上訴人要求對她生活費的命令的條件進行變更。
A tremulous or pulsating effect produced in an instrumental or vocal tone by barely perceptible minute and rapid variations in pitch. 顫音一種顫動或振動效果，由可察覺的微小迅速的音階變化在聲音或樂器的調子中產生的
The dial records showed a very slight variation in pressure. 刻度盤顯示出壓力有極微小的變化。
