旅游业是威尼斯的主要产业。

___Tourism is Venice's main industry.

这些美丽的古镇相对未受旅游业影响。

These beautiful old towns have remained relatively untouched by ___tourism.

如你所知，秘鲁是世界上旅游业最发达的国家之一。

As you know, Peru is one of the countries with the most ___tourism around the world.