A projecting gallery at the top of a castle wall, supported by a row of corbeled arches and having openings in the floor through which stones and boiling liquids could be dropped on attackers.是什么意思_A projecting gallery at the top of a castle wall, supported by a row of corbeled arches and having openings in the floor through which stones and boiling liquids could be dropped on attackers.在线翻译_英语_读音_用法_例句