機器
abstract
aerospace
air
aircraft
airline
airplane
aviation
blade
booster
close
closeup
detail
energy
engine
engineering
flight
flow
fly
force
grit
historic
industrial
industry
jet
mechanical
mechanical parts
metal
nozzle
outlet
part
plans
power
precision
quality
quality control
speed
steel
stream
technical
technology
thrust
transport
transportation
turbine
turbo
turbojet
up