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observation accuracy
观测精度
observation accuracy
observation adjustment
observation aeroplane
observation aircraft
observation airplane
observation aperture
observation apparatus
observation ballon
observation balloon
observation board
observation boat
observation cabin
observation car
observation check
observation circuit
observation condition
observation data
observation deck
observation desk
observation dome
observation door
observation equation
observation error
observation evidence
observation eyepiece
observation field
observation frequency
observation function
observation gallery
observation group
observation hip
observation hole
observation index
observation instrument
observation item
observation line
observation matrix
observation measurements
observation method
observation mine
observation mirror
observation monument
observation network
observation object
observation of fire
observation of inventory
observation of naviga...
observation of slope ...
observation of the work
observation oscilloscope
observation pair
observation panel
observation parallax
observation pattern
observation pipe
observation place
observation plan
observation plane
observation plate
observation platform
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