Ulcerative Colitis (UC) is a chronic and relapsing disease of the large intestine (rectum and colon) characterized by inflammation of the mucosa and submucosa.是什么意思_Ulcerative Colitis (UC) is a chronic and relapsing disease of the large intestine (rectum and colon) characterized by inflammation of the mucosa and submucosa.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句