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Robots don't clean toilets

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內容簡介top Robots Don't Clean Toilets 簡介 With the School Invention Fair coming up, Sam is determined to invent the best invention. First, he builds a robot thatl clean the toilet (but it refuses). He tries a fart fan (but that just creates a mess at lunch). Will Sam come to the fair empty-handed, or will he create something great and win a prize?

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