ulcerKK [ˋʌlsɚ] /ˈʌlsɚ/發音名詞1潰瘍醫學The doctor found an ulcer on the inside of her cheek.醫生在她的口腔內側發現一處潰瘍。2胃潰瘍口語Years of stress and coffee gave him an ulcer.多年的壓力和咖啡讓他得了胃潰瘍。3弊病、禍害比喻Corruption remains an ulcer eating away at public trust.貪腐仍是一個不斷侵蝕民眾信任的弊病。