speed gradient的用法和樣例：
例句
- The results show that a large velocity gradient emerges in the intermeshing region of the screw reactors, which is helpful to mix materials sufficiently.
結果表明，螺桿反應器的嚙合區具有較大的速度梯度，有利於物料的充分混合。 - Then the authors explain hypostasis of the velocity gradient and vortex, and make a try to unify the vortex coagulation theory and the conventional coagulation theory.
從根源上解釋了紊流流場中速度梯度和旋渦的產生，試圖把最近發展的渦旋混凝理論與傳統的混凝理論進行統一。
