roughage
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).
🗣️ 情景例句
I never understand what you are talking about, maybe it's the language barrier.