这个话题在网上非常热门，引起了很多讨论。

Zhège huàtí zài wǎngshàng fēicháng rèmén, yǐnqǐ le hěn duō tǎolùn.

This topic is very hot online and has sparked a lot of discussion.

这本书最近很热门，很多人排队买。

Zhè běn shū zuìjìn hěn rèmén, hěnduō rén páiduì mǎi.

This book is very popular recently; many people are lining up to buy it.

计算机科学已经连续几年都是热门专业。

Jìsuànjī kēxué yǐjīng liánxù jǐ nián dōu shì rèmén zhuānyè.

Computer science has been a popular major for several years in a row.