我们徒步穿过了一片茂密的森林。

We hiked through a ___thick forest.

她有一头浓密的漂亮黑发。

She has beautiful ___thick dark hair.

小径穿过一片沼泽，然后进入茂密的灌木丛。

The path led through a marsh and then into ___thick undergrowth.