The results show that the strengthening subtropical high pressure, the momentum transmission of jet stream in the middle-lower troposphere, a violent downdraft from upper air and a sudden intensification of the outer pressure gradient force of the tyhoon are the important factors due to the strong outer w.

The results show that a warm high ridge at the middle level and transformed surface cold high over the plain provide a good background condition;a cooling process produced by net surface radiation fluxes is the trigger and strengthening mechanism for the fog event;the subsidence flow at the middle and low tro.

However,the way to solve these problems is to understand fully the initiative or passive relationship between the psychological factors of phonation and play siological factors of phonation step by step,to solve the breath sinking,breath flowing,breath controlling and .