1. The city is famous for its density of population.
    这座城市因人口稠密而闻名。

2. There is a greater density of household goods.
    家用商品的密度更大了，

3. "In contrast, the animals that exercised inside the automatic wheel possessed a greater density of blood vessels in the brain than did either of the other two groups of animals."
    "相比之下，在自动轮中跑动的老鼠，较之其他两组的老鼠，其大脑的血管密度更大。"