The scene is the master frame so it has no parent (the NULL pointer).
此场景是主画面对象，没有祖先。
This article classifies frame-support structure into master frame and master support.
文章首先将框架一支撑结构分开为总框架和总支撑。
Life is good, to master, frame, front there is always a different scenery.
生活是好的，峰回路转，柳暗花明，前面总会有另一番不同的风光。
Life is good, to master, frame, front there is always a different scenery.
生活是好的，峰回路转，柳暗花明，前面总会有另一番不同的风光。
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