这里是禁烟区，麻烦你把烟熄掉。
No smoking is allowed in here. Please put out your cigarette.
我能换到非烟区吗？
烟囱中冒出的烟是这一地区的主要污染源。
The smoke from the chimney is the main cause of pollution in this area.
烟囱中冒出的烟是这一地区的主要污染源。
The smoke from the chimney is the main cause of pollution in this area.
应用推荐