downcast air的用法和樣例：
例句
- Experiments were conducted to investigate thermal decay in an underfloor plenum under different inlet air conditions and heat sources located in the test room on the plenum.
摘要對不同進風參數和不同室內熱源條件下地板送風靜壓層的熱力衰減進行了實驗研究。
及以上資源獨門創做，受著作權保護好，侵權行為必究
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