We were working on the eleventh floor.

我们在第11层工作。

《柯林斯英汉双解大词典》

I live on the eleventh floor.

我住第十一层楼。

youdao

The policeman was killed at the eleventh floor.

警察在11楼被杀了。

youdao

This time, I went to the eleventh floor, which Google has recently taken over.

NEWYORKER: Streaming Dreams

Stepping out of the elevator on the eleventh floor, I walked past the peeling wallpaper, the occasional graffiti.

NEWYORKER: Sweetheart Sorrow

The elevator doors opened at the eleventh floor, and, before I had time to get out, the two men in white entered with a gurney.

NEWYORKER: Sweetheart Sorrow