VOA慢速英语:Poor Oral Health Leads to Social and Emotional Problems

短语讲解：

1. That number represents more than half of the world's population.

more than 不止
例句：1.We have more than a car!
我们可不止有辆车！

2. Health officials are warning that failure to repair cavities can lead to social and emotional problems.

lead to 导致
例句：This may even lead to death.
这甚至可能导致死亡。

3. Professor Marcenes says cavities or holes  in permanent teeth are also known as caries.

be known as 被称为
例句：He who plots evil will be known as a schemer.
设计作恶的，必称为奸人。

4. It is likely to be related to a change in diet.

be likely to 可能,倾向于
例句：I shall be likely to catch cold if I go out tonight without my overcoat.
如果今晚不穿大衣出去，我会感冒的。

5. Wagner Marcenes says oral health problems can have a major effect on a person's quality of life.

have effect on 对…有影响
例句：Your eating habbits have effect on your health.
你的饮食习惯对你的健康有影响。