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How A Key Open The Lock1 [5 W, K& v+ `, C7 ~( v# N
开锁原理& Q4 s& P5 ]9 F; F
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How Trumpet Functions9 S+ R3 R/ j" ~$ w' `; ]
小号如何工作
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How Coins Are Filtered
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How Sewing Machine Works( q E& Y2 T _5 x; @4 J1 z
缝纫机工作原理
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+ N) U, A0 `% j1 Y9 {0 J* KHow a Zipper Works& X& y- k) a/ }, s
拉链如何工作
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How Your Heart Functions
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$ J6 k( f" b1 H( v. X6 wHow a Gun Works, l* r1 V g' ]) j
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How a Grenade Works: z- S2 \4 _. C$ {0 [
手榴弹如何工作
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How a Fan Works2 } V# c5 _* G: M$ c' d
电扇工作原理
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1 g0 s/ ^+ F% M) z4 BHow are necklaces made4 U2 w1 e ]/ f# \: A
项链是怎么做的% x( v( b; F+ p Q/ A1 r1 a0 S* f
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9 Q$ K8 X( H3 D" pChain making machines! V1 m2 ]) v b
环状铁链制作* d+ {5 \. h) @/ h# ^! [* A' P
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Food processing machines3 w C# e# ]( |7 W& U W
食品加工机器
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0 z: @8 C8 a% i* P+ w2 z3 _圈圈蝴蝶饼干1 \/ T* @6 \5 N9 ]
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奶油夹心饼干% X5 N2 x5 c7 w0 r3 I! I
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1 A& e/ m; ?7 W3 J, W( W' T脆皮甜筒
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Smart inventions& M/ x5 E( p5 C
机智的发明# h/ F/ G, V* L: h3 r& n" r
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