问题如下：
When Country A increases its exports to Country B, what tends to happen to the exchange rate between the currencies of A and B?
选项：
解释：
Country A’s currency tends to strengthen relative to Country B’s currency because importers in Country B will find it necessary to buy Country A’s currency to pay for goods.
增加出口，应该是货币升值。
但这里答案都是：Country A’s currency tends to strengthen relative to Country B’s currency。
有点不是很理解这个逻辑，为什么tends to strengthen relative to Country B’s currency就是升值，降低就是贬值。
