空气属于物质名词,不可数;英语中不可数名词一般不加冠词,但是如果表示特指时就必须加the,请对比:
Air is important for life.(泛指意义,不加the)
The air in the balloon has been let out.(特指气球里的空气,故加the)
空气属于物质名词,不可数;英语中不可数名词一般不加冠词,但是如果表示特指时就必须加the,请对比:
Air is important for life.(泛指意义,不加the)
The air in the balloon has been let out.(特指气球里的空气,故加the)