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adjustment knob /ɐdʒˈʌstmənt ˈnɒb/ n

中文：调节旋钮

中文 · 调节旋钮Español · rueda para graduar el respaldoFrançais · commande de dossier
Meaning：The seat’s regulating mechanism, for changing the angle of the backrest to an almost horizontal position.
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Bucket seat side view

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