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How A Key Open The Lock: |# h: V% Z( F$ ~; {
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How Trumpet Functions+ J% Q4 g8 Y0 W" E- @) X. S- x
小号如何工作
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, F3 X1 S4 C! jHow Sewing Machine Works
! V! a1 Z1 K9 S* K- K* U" L缝纫机工作原理
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How a Gun Works
, ]8 O& r6 @" `6 y- K7 m8 h枪的工作原理$ [1 g9 x# u/ x
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- U2 B4 e' E. @How a Grenade Works
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5 s6 T9 |( n! ^' `7 r) ^- JHow a Fan Works
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4 R/ F+ A6 t4 G% G! h2 V# eHow are necklaces made
) c6 |% C7 y( b: P1 F$ j1 G项链是怎么做的5 u: C4 w: q9 E. f5 G% ]# F' l
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Chain making machines% {3 [6 v5 G" ?1 F
环状铁链制作
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Food processing machines
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脆皮甜筒
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Smart inventions
6 K$ s0 M: g8 |( Y2 b( F. g机智的发明
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