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How A Key Open The Lock
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How Trumpet Functions
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$ h. f; X) j, G( hHow Coins Are Filtered
1 A+ Z( k5 C- Q硬币是怎样过滤分类的
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How Sewing Machine Works- i% W, a! R( y) F! m, K
缝纫机工作原理
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How a Zipper Works" V" s4 `3 A* Z: ~, ^. w
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心脏的工作原理
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How a Gun Works
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电扇工作原理7 w$ y9 U( s' i/ ]
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& q- q) `9 U+ ^: ]% [. M8 K7 QHow are necklaces made7 ~6 u, q7 O' f' T9 c
项链是怎么做的3 `5 S- |- r4 @/ Z" Y
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Chain making machines
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' ~% d* Z7 L) P2 |Food processing machines
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脆皮甜筒
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2 A( Z! @8 [+ i- y9 H3 tSmart inventions
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