每日口說挑戰
TED-Ed:是什麼原因導致口臭? (What causes bad breath? - Mel Rosenberg)
今日挑戰句子
The presence of bacteria in your body is not only normal, it's actually vital for all sorts of things, like digestion and disease prevention.
體內有細菌是很正常的,事實上細菌在很多方面都很是重要的,像是消化跟預防疾病。
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