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How A Key Open The Lock) C. Q p: q; J$ {
开锁原理
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' S" L# b* x% q小号如何工作
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, X- [% y+ w1 z* P& Q/ m; UHow Coins Are Filtered. g% g# `/ W. ]+ b* z
硬币是怎样过滤分类的
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How Sewing Machine Works
$ z9 M/ {9 p6 r9 ~& x2 s缝纫机工作原理1 p# u- K. F; _! P
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拉链如何工作/ c0 ]6 |. E1 d A' p
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How Your Heart Functions4 t4 n8 E/ `7 m% c% @4 t
心脏的工作原理
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% F# U& h& J/ j8 o7 ^2 aHow a Gun Works, r6 J0 M+ V( }% ^6 f3 {& M, f
枪的工作原理
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How a Grenade Works
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How a Fan Works
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How are necklaces made
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Chain making machines
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2 d2 ^8 m' B5 I! G) j2 ~& xFood processing machines
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圈圈蝴蝶饼干
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9 J4 Q( r* Z4 p W h奶油夹心饼干
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1 y4 M: c" _' A: N3 B6 e# {5 F脆皮甜筒
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1 I" O( R8 A, N7 ~1 c- B麦当劳派
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Smart inventions
' c% x& K) L7 R0 r机智的发明
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