an eye for an eye

an eye for an eye and a tooth for a tooth

eye and eye turnbuckle

eye relief (=eye-point distance)

eye relief，eye distance

eye to eye contact

eyetoeye contact

2D-vortex

3D stand vortex

3-D vortex

500 hPa northern polar vortex

700 hPa low vortex

a ll-over-controlled-vortex

adiabatic invariant of vortex

adjacent vortex

Air Jet Vortex Spinning

Aircraft Vortex Wakes

Aircraft Wake Vortex

air-entraining vertical vortex