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How A Key Open The Lock
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1 v1 p1 y4 R' }0 N* B; j: yHow Trumpet Functions( _/ p3 A7 ^/ o- c3 t. t
小号如何工作
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9 O- K! W$ i' ]. Y8 r) K& c/ ^How Coins Are Filtered
+ x) P: ?; M1 {! R: v/ J硬币是怎样过滤分类的
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( h; ^* B. A4 I8 gHow Sewing Machine Works8 Q* V6 Y4 a' U7 c
缝纫机工作原理
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How a Zipper Works
% `; B% h7 |: c拉链如何工作
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How Your Heart Functions; J3 f; N* l! w- d" _ u
心脏的工作原理
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9 p V% g, ], rHow a Gun Works- H: G& {6 ~0 a+ f
枪的工作原理
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How a Grenade Works
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How a Fan Works
1 R/ @* Q* \" J3 V: ^电扇工作原理
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( T2 _0 r/ m( d2 l. o/ s" E3 SHow are necklaces made
! p3 `. E6 H l# Z" `' `4 w" N项链是怎么做的
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Chain making machines
- \, Q0 ~& Y# E3 J5 C) v; k8 ?环状铁链制作
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6 K+ s+ I+ C( Q& Y5 }Food processing machines
7 E; [& P s0 y9 \食品加工机器
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圈圈蝴蝶饼干
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0 p; C; v( G# L3 i7 l( ~+ g& m奶油夹心饼干
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" K7 J; \" M; n9 {+ u脆皮甜筒
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. O2 |# g3 _9 p! H; z. ?7 W麦当劳派
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Smart inventions4 [5 }. \5 N* \* V
机智的发明

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