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Vacuum Cleaner Assembly Model Children's Scientific Experimental Equipment Set Diy Wind Suction Structure Principle

Clockwork Winding Piano Assembly Model Children's Scientific Experimental Equipment Set Diy Spring Structure Principle

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Cutting Machine Assembly Model Children's Scientific Experimental Equipment Set Diy Temperature Melting Point Heating Principle

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Bicycle Assembly Model Children's Scientific Experimental Equipment Set Diy Chain Belt Transmission Principle

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Suspended Flying Ball Assembled Model Children's Scientific Experimental Equipment Diy Atmospheric Pressure Density Principle

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