旅游业在英语中被称为 "tourism industry"。这个词来源于两个英语单词："tour" 和 "ism"。"Tour" 意思是旅行，而 "ism" 是一种行为或倾向。因此，"tourism" 可以被理解为旅行行为或倾向。将它与 "industry" 连在一起，就可以得到 "tourism industry"，意思是旅游业。

一些例句如下：

The tourism industry is a major contributor to the economy of many countries.

The government is investing heavily in the tourism industry to promote the country as a tourist destination.

The rise of online booking platforms has had a huge impact on the tourism industry.