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air valve /ˈeə ˈʃaft/ n

中文：空气阀

中文 · 空气阀Español · válvula de aireFrançais · soupape d’arrivée d’air
Meaning：Movable part whose opening is regulated by the trigger; it lets compressed air into the gun.
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Found in these illustrated scenes（2）

Airbrush cross-section Spray paint gun

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