Being protected by a thick wall, they felt quite safe.

有一堵厚墙掩护，他们感到很安全。

youdao

Being protected by a thick wall, they felt they were safe.

有一堵厚墙掩护着，他们感到很安全。

youdao

Being protected by a thick wall, they felt they were very safe.

由于有一堵墙掩护着，他们感到很安全。

youdao

At night, a thick wall of noise seemed to edge closer and louder in proportion with my sleeplessness.

WSJ: A Trumpet in the Wild

Woods hooked his tee shot deep into the trees, where he was surrounded by a thick wall of fans.

NPR: Sergio Implicates Tiger For Bad Shot At Players

He is only allowed to see his family once a year and visitors are separated by a thick wall of glass.

BBC: Belarus's university in exile