Currency exchange rates are always subject to variation.

货币兑换率是经常变动的

The exchange rate is in our favour at the moment.

目前汇率对我们有利。

In September 1989 the exchange rate hovered around 140 yen to the dollar.

在1989年9月，汇率一直在140日元比1美元左右徘徊。

Our calculations of the cost of our trip were thrown out by changes in the exchange rate.

我们旅行费用的计算因为汇率变动而完全打乱了。

Although the official exchange rate is set around 7 kyats to one USD, the street rate can go as high as 1000 kyats.

尽管官方汇率被定为7缅元等于一美元，但街市汇率能达到一美元兑换1000缅元。

What is today's exchange rate?

请问今天的兑换率是多少？