What's the difference between air and sky?

To learn to play numbers, we should know that there are schools and controversial issues in society. There are two versions of ancient books, one is the complete version, and the other is the complete version, so there are two schools in society. There is only the sky in the book, but no air. The complete works have both heaven and qi, and the six evil spirits refer to qi instead of heaven, so the sky is weak. In Anxing's law, nature and strength, the earth and air of the complete works are equivalent to the sky of the whole book. If you study the whole school, you must use the sky. If you study the whole school, you must use the air.