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How A Key Open The Lock* r" x! W6 `. r$ z" G" G
开锁原理
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小号如何工作5 [. L/ a0 [: P2 D! W! \/ o4 {
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3 t d5 ?1 a8 `: ]0 i1 EHow Coins Are Filtered3 T, C: k2 w: r1 s" u9 F
硬币是怎样过滤分类的
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8 G* Q; y$ d4 A- lHow Sewing Machine Works
2 j% O- k! o- B0 s3 h8 T缝纫机工作原理: ~: U" R' d0 O4 j0 Y: g& u
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8 H$ t. j5 A; r9 n6 Y6 z0 T% X" q7 j9 hHow a Zipper Works
9 w& H Z% [ v. y6 Z7 [* B+ z拉链如何工作
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& _0 I' Z: |: C/ ?+ A& `, cHow Your Heart Functions
( I2 b& {, W# U; T心脏的工作原理
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How a Gun Works
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How a Grenade Works) }: e L2 K2 T* S; U
手榴弹如何工作
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How a Fan Works
3 W8 l) ~% G @+ P/ C电扇工作原理6 U7 a+ j- Y6 u7 C3 U
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How are necklaces made2 V, |4 J0 _ S
项链是怎么做的
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Chain making machines5 Q5 L* m, | L @4 t
环状铁链制作8 j5 q) ~+ Z+ Y! @ N7 U2 }, w
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Food processing machines
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/ n/ R% C4 M' G N5 d1 V$ s i圈圈蝴蝶饼干
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奶油夹心饼干
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脆皮甜筒
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Smart inventions4 C# q- H" Z3 Q
机智的发明9 J, M+ U' ~/ Z9 r: @ t/ ^
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