His mouth dropped lower and lower as five of us trooped out of the small romm.
问题描述：
His mouth dropped lower and lower as five of us trooped out of the small romm.
答
mouth dropped lower and lower 嘴角越来越低,可看作是不开心么…… 我可以当是“当他看到我们5个排列走出那个小房间,他越来越不开心”么……