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The limitation of Qplot () is that it can only use one dataset and a set of graphical property mappings, and the solution to this problem is to use layers. Each layer can have its own data collection graphical property map, and additional data elements can be added to the layer through layers.A layer consists mainly of 5 parts: data, a set of graphical attribute mappings, geometric objects, statistical transformations, and position adjustments. 1. Create drawing objects When calling Qplot (), it