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How A Key Open The Lock
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8 p& c# Z6 `) J8 oHow Trumpet Functions
7 o9 y( B6 O0 z5 K小号如何工作: s! I7 S q2 _& l
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! k; e* ^) A( N: MHow Coins Are Filtered
3 u( v5 S+ Q* ?硬币是怎样过滤分类的
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6 K2 R# P8 t# i8 w7 A1 E3 wHow Sewing Machine Works
r& z3 `) r6 ^缝纫机工作原理
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' T2 o: T8 p# |; C: h2 gHow a Zipper Works
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How Your Heart Functions2 z) P% _' H- j# r$ ?; c
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7 V B- k: P6 D2 g6 U9 S' nHow a Gun Works
" G. C% Y0 l5 }% Z' Y% N- E% q枪的工作原理
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1 I7 V; a: v z* g) a$ y- R2 ]How a Grenade Works( T+ L4 i/ Z5 {# V, @, f
手榴弹如何工作
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* Z7 V9 O: X9 `4 zHow a Fan Works. J6 N# `6 {1 n
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How are necklaces made
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环状铁链制作
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Food processing machines
2 \& i, ?( f0 L* Q5 d2 T& J8 _食品加工机器
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& x g/ O, }- N0 D& s; _圈圈蝴蝶饼干
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3 |- F7 p- T2 m2 b奶油夹心饼干
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机智的发明7 A1 W5 J, S. C, `
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