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How A Key Open The Lock
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How Trumpet Functions
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How Sewing Machine Works
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How a Zipper Works* s x9 Z, w. \8 w. ~, k
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How Your Heart Functions) m+ t4 Y/ ?" o. c" J, M5 W, s
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How a Gun Works/ @& ^; H3 h- M0 b
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$ @/ \. x* l* T' b1 X# h% K* r0 DHow a Fan Works
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$ s3 k2 V! Z) zHow are necklaces made
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Chain making machines z( d! u7 p6 |# Y$ u9 c
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食品加工机器6 x' j, k2 g$ H: }
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圈圈蝴蝶饼干
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麦当劳派
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Smart inventions
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