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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
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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
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How a Zipper Works
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How Your Heart Functions; J3 f; N* l! w- d" _ u
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How a Fan Works
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( T2 _0 r/ m( d2 l. o/ s" E3 SHow are necklaces made
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Chain making machines
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6 K+ s+ I+ C( Q& Y5 }Food processing machines
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圈圈蝴蝶饼干
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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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这里因你而精彩
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发表于 2019-5-4 10:07:01
