friction drag的用法和樣例：
例句
- In superplastic forming, bulk metallic glass has larger surface friction resistance than ordinary metal alloys.
大塊非晶合金在超塑性成形時呈現出比一般金屬材料更大的摩擦阻力。 - The conditionality between the flow rate and the pipe diameter is discussed when the friction factor is fixed.
文中還分析了在摩擦阻力系數一定的情況下，流量與管徑的制約關系。
