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wooden car fire truck diy toy 3d jigsaw puzzl insight into differences and understanding size learn while playing, and teach while having fun,in the process of splicing, children first need to have a "whole" image in their minds, and then use small "parts" to assemble. grip pairing game wire ring puzzle,when playing puzzles, we should observe the layout at any time and place. children also need to constantly build "imaginary" patterns in their minds. when the number of puzzles is increasing, children need to remember more..syi