慢速英语:Study: British Have Better Teeth Than Americans

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短语讲解：

1. In the United States, people either pay for their dental care or buy dental insurance.

pay for 赔偿; 为…付钱; 因…受罚
例句：I' ll give you double pay for working overtime.
你加班我付你双倍工钱。

2. The United States was in the middle of the rankings.

in the middle of 在...中间
例句：A beautiful stone fountain was set in the middle of the garden.
花园中央砌造了一个漂亮的石头喷水池。