the third shade purpose is placed in a vaccum
third_thoracic_vertebra is dorsal_vertebra. mirror_frames is silver_leafed. northern_three_striped_opossum is mammal. newtonian_telescope has primary_mirror sun_visor is shade. third_ventricle is ventricle. third_base is position. third_lumbar_vertebra is lumbar_vertebra. shade is protective_covering. shade is semidarkness.