不大的房间内聚集了二三十人，空气中夹带着血腥味，本就稀薄的空气，更是令

不大的房间内聚集了二三十人，空气中夹带着血腥味，本就稀薄的空气，更是令人窒息。

Results (English) 1:

Twenty or thirty people gathered in the small room, the air smelled of blood, and the thin air made it even more suffocating.

Results (English) 2:

Twenty or thirty people gathered in the small room. There was a smell of blood in the air. The thin air was even more suffocating.

Results (English) 3:

Twenty or thirty people gathered in the small room, and the air was filled with bloody smell. The thin air was even more suffocating.