Why is there still strong air current in clear skies in Wan Li? Can strong airflow be understood as wind?

The clear sky is turbulent because there is a region with a large horizontal temperature gradient on the ground at mid-latitude, and the temperature drops sharply from south to north. You know the geostrophic deviator, right? The airflow from south to north will be biased to the west wind, and the wind speed will rise sharply with the increase of height (due to friction), forming a clear-sky turbulence with extremely fast wind speed (30m/s) in the air.

The movement of any gas can be said to be wind, but the "wind" that can cause the aircraft to bump is that the size of the air mass is similar to that of the fuselage, about 10-200 m. Beyond this range, the aircraft will only move with the air mass without bumping.