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·¢±íÓÚ 2019-5-4 10:07:01
How A Key Open The Lock, p! {4 a! v4 S4 N! i; U# L, x
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How Trumpet Functions
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How Coins Are Filtered
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, ~' C" m# b) L4 [ R) N' IHow Sewing Machine Works
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How a Zipper Works
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How a Grenade Works: a1 ?$ m; C" F
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How a Fan Works
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Chain making machines
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Food processing machines: A" \5 v- p$ L. t; K
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