English中文EspañolFrançais
jack spring /ˈdʒak ˈspɹɪŋ/ n

中文：顶杆弹簧

中文 · 顶杆弹簧Español · resorte del martineteFrançais · ressort d’échappement
Meaning：Spring that allows the jack to return to its position under the hammer butt once the key is released.
▶ Start interactive picture-tap lesson

Found in these illustrated scenes（1）

Upright Piano Action

‹ Browse all scenes