英文關鍵字
background
balls
barrier
beach
buoy
curve
hindrance
hurdle
impediment
level
many
moving
nature
obstacle
obstruction
oscillate
seal
separation
surface
water
wave
wavy
yellow
英文關鍵字
background
balls
barrier
beach
buoy
curve
hindrance
hurdle
impediment
level
many
moving
nature
obstacle
obstruction
oscillate
seal
separation
surface
water
wave
wavy
yellow