英文關鍵字
activity
aerodynamic
airscrew
antenna
blade
connection
control
controlled
design
electricity
engine
fail
falls
flying
frequency
fuselage
gear
helicopter
hobbies
hole
isolated
leisure
mobility
model
motion
object
pattern
power
propeller
radio
rotate
rotor
rudder
single
slides
small
speed
stops
supporting
table
technology
toy
turning