topmost hood rings口: mouth圈: circle; ring口圈: ring of ports炉口: fire hole; furnace mouth; glory hole; mouth of furnace; nose cone; nozzle; throat opening凹口圈: notched ring下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:炉口圈，即可在微信中查询翻译
