The smoke floated up around the flat square of lighted glass in the ceiling.

烟雾在天花板上四方形的发光玻璃周围飘浮。

The prince, when he found himself alone, lit a cigarette and puffed at it quietly, sending little blue rings of smoke floating up to the ceiling.

王子发现只有他一个人，就点了一根烟，静静地吸了一口，蓝色的小圈圈烟雾飘上了天花板。