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How A Key Open The Lock e! R7 J( \5 M+ f
开锁原理
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How Trumpet Functions
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How Coins Are Filtered
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" \# ^0 i4 W5 G# ]4 M8 MHow Sewing Machine Works
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拉链如何工作
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How Your Heart Functions- D9 _& O2 O2 A2 l
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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: m3 V- w; i6 q( Z" @/ X) N& Z/ fHow a Fan Works8 o, J1 |( K4 p! M6 x7 K" c
电扇工作原理5 j! j/ K" Y Q( S' ~* ^$ G% Y
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How are necklaces made
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6 l: Z3 E5 g2 U9 D1 aChain making machines3 [# G" c$ C! W! R2 K" E/ Y
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q0 E4 C' E" o* F K$ K; T( OFood processing machines
0 ]. c8 a4 ^" T/ r食品加工机器
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6 ^! V7 D5 _+ B# ]; O圈圈蝴蝶饼干
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奶油夹心饼干
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Smart inventions
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