慢速英语:Drug Helps Teeth Repair Themselves

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1.dentist n.牙科医生
例句：Visit your dentist twice a year for a check-up.
每年去牙医处做两次牙齿检查。

2.replace vt.代替; 替换
例句：The council tax replaces the poll tax next April.
市政税在明年4月将取代人头税。

3.approve vt.赞成，同意
例句：Not everyone approves of the festival
不是所有人都赞成庆祝该节日。

4.affect vt.影响; 假装; 感动
例句：Nicotine adversely affects the functioning of the heart and arteries
尼古丁会对心脏及动脉功能造成损害。

5.possibility n.可能，可能性; 希望
例句：We were not in the least worried about the possibility that sweets could rot the teeth
我们以前完全不担心吃糖果有可能会蛀牙。