нижній край точки прицілювання
bull's eye
hit the bull's eye
bull's-eye
eye-guard; eye guard
pad eye / pad-eye
wind's eye (in the wind's eye)
bull
bull-pup
daily bull
bottom
bottom mine
bottom of the hull
bottom plating
bottom sweep
double bottom
double bottom space
inner bottom
outer bottom
bottom carriage
bottom end of stroke
bottom escape
bottom gear
bottom gun carriage
bottom half
bottom plate
bottom rib of piston
bottom run (of tank track)
bottom sleigh
bottom surface of bolt
bottom-dump hauler
bottom-of-the-barrel reserves
crankcase bottom half