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How A Key Open The Lock
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How Coins Are Filtered
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How Sewing Machine Works1 H) }! y. l' d4 ]* ~6 ~6 b
缝纫机工作原理
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How a Zipper Works& ~* X. H8 g* y3 M+ A* T- _( ^
拉链如何工作
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How Your Heart Functions# b& U1 }4 A* K7 Y9 f' c! C/ w% K
心脏的工作原理
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How a Gun Works
/ p) I0 ]# a3 o+ f2 I枪的工作原理
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' A! M0 s; E3 F( j A$ F# D3 ?How a Grenade Works
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, K: ]% w8 L% y" BHow a Fan Works
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/ [) F% D; y6 K, N9 zHow are necklaces made
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Chain making machines! i. `- ?% G( `/ L
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Food processing machines
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1 v; s; m0 b9 ?5 F7 ]( o) O奶油夹心饼干
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机智的发明7 |) x. Y+ V+ w
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这里因你而精彩
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