dense

我们在徒步时在茂密的森林中迷路了。

We got lost in the ___dense forest during our hike.

浓雾让我很难看清前方的路。

The ___dense fog made it hard to see the road ahead.

我们徒步穿过了一片茂密的森林，里面长满了高大的树木。

We hiked through a ___dense forest full of tall trees.