branch duct的用法和樣例：
例句
- The inside of the branch pipe needs welding and grinding.
支管內部需補焊打磨。 - By dividing an extraction zone into a finite number of segments, an analysis for each segment is based upon a direct application of the duct branch with uniting flow.
方法的要點是利用風道支管流量和壓損計算的半徑驗方法，將抽汽流道分成有限個弧段，視每一弧段為一混合流支管，形成計算模型。
