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How A Key Open The Lock4 M( t! G! H& h* \5 m
开锁原理; R, h) E4 r' o1 m
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+ M: @: O+ K: A& n" M2 r2 o# x( t小号如何工作8 w v8 Y0 C' a7 _
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How Coins Are Filtered
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How Sewing Machine Works
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How Your Heart Functions+ M0 ` t a' p: F, O2 J
心脏的工作原理
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How a Gun Works
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How a Grenade Works
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; k ]5 r8 Y- j5 \$ A) }) t3 WHow a Fan Works
$ p7 o. i* x$ j' A电扇工作原理1 f- E# V4 w' a, {+ x1 ^
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/ ]5 p6 g% t' s2 h1 |/ kChain making machines
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5 v( A/ v& H$ X1 qFood processing machines; y& p, k! U( n: P5 n) e, O
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1 r- m3 F5 K7 v4 _: C" b$ b圈圈蝴蝶饼干; K( a2 u& a; G! v/ t) b9 x! ^8 b
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: w5 i0 z3 E2 v% F5 a8 w奶油夹心饼干
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Smart inventions
( U$ N9 P# g* J" r2 P" a1 V机智的发明
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