Example The buildings of the Acropolis in Athens, Greece all include cornices. 연마제 및 광택제로 사용되는 매우 단단한 광물, 결정화된 알루미나 또는 알루미늄 산화물입니다. A method of keeping the head of a screw or bolt, used to join sections of a work, below the outer surface of the materials.