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regulating button /ˈɹɛɡjʊlˌeɪtɪŋ ˈbʌtən/ n

中文：调节钮

中文 · 调节钮Español · reguladorFrançais · bouton d’échappement
Meaning：Part that pulls the jack back before the hammer strikes the string or strings.
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Upright Piano Action

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