roughage/ˈrʌfɪdʒ; `rʌfɪdʒ/ n[U]indigestible material in certain plants used as food (eg bran) that stimulates the action of the intestines, and helps the digestion of other foods 粗糙食物（不易吸收的粗纤维, 如糠、 麸, 可刺激肠蠕动, 有助於消化他种食物）.
牛津英汉双解词典