A perfectly flexible uniform cable is suspended beneath the helicopter.

直升机下方悬挂着一根完全柔韧的统一电缆。

That is why a uniform flexible cable hangs in a straight diagonal line when pulled at constant speed by a helicopter.

这就是为什么当直升机以恒定速度拉动时，均匀的柔性电缆会呈直线对角线悬挂。