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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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& @$ u0 M: |" [* _) Z d, YHow a Zipper Works
5 l; C1 O1 S1 E. {' c0 ]拉链如何工作
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How Your Heart Functions
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How a Gun Works0 `- @- M6 T$ W) ~5 b
枪的工作原理
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How a Grenade Works
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How are necklaces made
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Chain making machines2 _# I- r& l% E. a- Y
环状铁链制作
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8 }5 D1 `7 E8 H; w JFood processing machines: h8 `6 s9 e8 a3 V. O$ v; ~
食品加工机器
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圈圈蝴蝶饼干
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奶油夹心饼干9 P+ p+ N& m- ~$ m
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Smart inventions
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