这个地区人口稠密，交通压力很大。

Zhège dìqū rénkǒu chóumì, jiāotōng yālì hěn dà.

This area is densely populated, and the traffic pressure is very high.

森林里树木稠密，阳光很难照进来。

Sēnlín lǐ shùmù chóumì, yángguāng hěn nán zhào jìnlái.

The trees in the forest are so dense that sunlight can barely get through.

上海是世界上人口最稠密的城市之一。

Shànghǎi shì shìjiè shàng rénkǒu zuì chóumì de chéngshì zhī yī.

Shanghai is one of the most densely populated cities in the world.