velocity gradient的用法和样例：
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.
结果表明，螺杆反应器的啮合区具有较大的速度梯度，有利于物料的充分混合。 - 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.
从根源上解释了紊流流场中速度梯度和旋涡的产生，试图把最近发展的涡旋混凝理论与传统的混凝理论进行统一。
