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branch duct /ˈbɹantʃ ˈdʌkt/ n

中文：支通风管

中文 · 支通风管Español · conducto secundarioFrançais · gaine de dérivation
Meaning：Duct, usually made of sheet metal, carrying the hot air toward the registers.
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Found in these illustrated scenes（1）

Forced warm air system

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