No matter how you squeeze it, the colors in multi-colored toothpaste never mix—what’s the principle

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cool! How many marbles can 2 cleaning trucks hold in 3 trash cans? excavator construction vehicle to

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This RC excavator is so handsome, how many people like this painting

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What modifications can be made to an excavator? #PopularScience #Unzip #LargeMachinery #Excavator

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