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How A Key Open The Lock
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How Trumpet Functions
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) a8 i* w& \% {( C5 M8 E6 q- gHow Coins Are Filtered
/ ` c: @5 S3 Q, w, a$ H硬币是怎样过滤分类的
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How Sewing Machine Works8 R8 _5 w& A. \* |5 j M5 i7 ~
缝纫机工作原理2 L5 G0 ?9 n% [) M3 @' {
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拉链如何工作
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How Your Heart Functions+ H% W' r3 h- D- u% V6 x: ~
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4 N4 J: i+ y( B# XHow a Gun Works
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How a Grenade Works3 a( k8 e+ ?& Q( x( W
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) k3 }' E4 E; Q4 a8 {How a Fan Works
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6 S# I+ j) q! I) Y, `# j! GHow are necklaces made
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Chain making machines$ C+ D6 p% R1 ~! l3 F. a" X& u
环状铁链制作
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- A# w' H8 o$ D* oFood processing machines
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圈圈蝴蝶饼干
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" ~3 y1 ]' G8 V) X脆皮甜筒
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Smart inventions
# I8 H, M0 e: `9 {$ H& Q H机智的发明
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