They earned foreign exchange, because most of the products were sold abroad.

他们赚取了外汇，因为大部分产品销往国外。

In turn, international tourism became the concern of a number of world governments since it not only provided new employment opportunities but also produced a means of earning foreign exchange.

反过来，国际旅游业成为许多世界政府的关注点，因为它不仅提供了新的就业机会，而且还产生了一种赚取外汇的手段。