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How A Key Open The Lock
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How Trumpet Functions
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How Coins Are Filtered
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缝纫机工作原理
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枪的工作原理
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How a Grenade Works
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# f5 M: G2 p" s3 ^How a Fan Works
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How are necklaces made
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Food processing machines4 h/ D0 ?. R [ m" B
食品加工机器
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圈圈蝴蝶饼干
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6 E0 s0 A, U5 j& r" `0 o- s# m奶油夹心饼干
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Smart inventions8 }# j0 e" g( ~4 m; e* ]) }
机智的发明+ Y2 B3 q% F; S' {$ N& n
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这里因你而精彩
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