密集

这片区域密集了很多工厂，空气会受到一定影响。

Many factories are densely concentrated in this area, which has some impact on air quality.

军队密集在山口，准备发起进攻。

Troops are massed at the mountain pass, preparing to launch an attack.

这里是高楼密集的商业区，交通非常拥堵。

This is a commercial district packed with high-rise buildings, and the traffic is very congested.

经过一周密集的训练，我们的水平提高了很多。

After a week of intensive training, we improved a lot.