VOA慢速英语:China’s Money Drops in Value

短语讲解：

1. In the past, China would set a midpoint for trading each day based on a group of currency exchange rates.

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。

2. Treasury has said it is too early to say what the changes will mean.

too...to 太....以至于不能....
例句：The box is too heavy for the little boy.
这个盒子太重，小男孩搬不动。