adj.易碎的；松散的
Colonoscopic views of less severe UC are seen below, with friable, erythematous mucosa with reduced haustral folds. 可見到并不嚴重的潰瘍性結腸炎的結腸鏡檢圖，易碎的紅斑粘膜，伴結腸帶減少。
