sentences: glacial still often hydrogen mercury to appear polished
docs: mercury_fulminate is high_explosive. mercury_vapor_lamp is ultraviolet_lamp. solid_mercury is solid. mercury is metallic_element. mercury is opaque_thing. mercury is liquid_at_room_temperature. mercury has metallic_core solid_mercury is mercury. mercury is in_liquid_phase_at_room_temperature. mercury is liquid_metal.