bulla英美 [ˈbʊlə]n. 垂饰,教皇的印玺,御玺; 大疱,(大)泡,大水疱,蕈状泡; 前缘胀部,蜡管突,气门片医学COCA.41373英英释义nounthe round leaden seal affixed to a papal bull(pathology) an elevation of the skin filled with serous fluidSynonym:blisterbleb双语例句