英文關鍵字
aerodynamics
airplane
aviation
aviator
blue
flight
flying
freedom
glider
gliding
hobby
landing
leisure
license
pilot
sailplane
seater
silence
silent
sky
touchdown
training
two
upwind
wingspan
英文關鍵字
aerodynamics
airplane
aviation
aviator
blue
flight
flying
freedom
glider
gliding
hobby
landing
leisure
license
pilot
sailplane
seater
silence
silent
sky
touchdown
training
two
upwind
wingspan