The lower frequency is associated with decrease of vortexcurrent.
频率太低，涡漩电流减小，同样导致搅拌力下降。
2
As one of the most symbolic characters in Chinese traditional culture, the ancient character of "HUI" is like a vortexcurrent, which means "return".
“回”作为中国传统文化中最具代表性的文字，它的古文字型是一个水流回旋的漩涡状，寓意旋转、回归。
3
These solutions belong to the intrinsic electromagnetic vortices, the corresponding magnetic field perturbations and the longitudinal current are continuous on the boundary of the vortex.