慢速英语:US Gas Prices Fall to Lowest Prices Since 2004

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短语讲解：

1. The average price in the U.S. was $2.06 per gallon for unleaded regular, according to the American Automobile Association (AAA).

according to 根据
例句：According to her, grandfather called at noon.
据她说,祖父在中午打来电话。

2. Because nearly 90 percent of Americans will travel by car over the winter holidays, the savings will add up.

add up 加起来; 总计
例句：The bills add up to exactly $100.
这些帐单加起来正好一百元。

3. The prices differ based on available supplies, taxes imposed by governments and the amount of subsidies.

base on 使建立在…基础上
例句："Base on Yunfu, orient to the world and aim at the future."
立足云浮,面向世界,走向未来。

4. Venezuela not only produces oil, but heavily subsidizes gasoline to keep prices near zero.

not only...but(also)...不但……而且……
例句：These not only help in presentation but also help orient users.
这不仅有助于表达，而且可以帮助使用者在创建时更好地定位。