機器
agriculture
american
art
button
color
colorful
contour
country
countryside
design
ecology
energy
farm
farming
farmland
flat
graphic
icon
illustration
isolated
line
linear
lineart
mill
old
outline
power
propeller
pump
ranch
rectangle
renewable
rotation
rural
silhouette
symbol
technology
tower
traditional
turbine
vane
vintage
water
well
white
wind
windmill
windpump