Unit 78：Brush and floss

　　第78单元：用餐后要刷牙和剔牙

　　Finish every meal by brushing and flossing your teeth.

　　每次用餐完毕后，要刷牙以及用牙线剔牙。

　　Your mouth will feel so fresh and clean that you won't want to put more food in it.

　　这样你的口腔会感到清爽干净，也就不会想吃东西了。