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How A Key Open The Lock
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X+ Q5 c+ Z: v1 V7 i- dHow Trumpet Functions
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9 f, Q1 O( d% T+ r* H" gHow Coins Are Filtered/ `$ O8 V% y% d* {4 n9 w% h6 P" ?
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. H7 B2 l5 X% x* p+ UHow a Zipper Works8 Z! R% m5 f- M1 B" |$ v
拉链如何工作% d9 V: d; ^, V9 w$ h8 W" F6 J$ w4 {
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How Your Heart Functions
, {$ W, Z7 s- ]0 s# e" v/ X( L9 C心脏的工作原理
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枪的工作原理
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! Z. b+ o# W5 rHow a Grenade Works
+ k# _; N# t/ ?5 A6 ?- d8 n2 b Z9 K1 b$ R手榴弹如何工作
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3 l6 x3 H* E, b: T$ @/ t/ WHow a Fan Works6 H! I/ T6 \$ D P9 k) j( d
电扇工作原理8 p. @, M' i. J' t c% {
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% s1 {) e/ @5 K5 x0 Y( C! j" z' x7 c# [How are necklaces made
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4 ?) s# T. q) ^. y. M MChain making machines
7 ~8 ^# `# Y( e( ~+ i' c' c环状铁链制作
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Food processing machines# L4 g: V& O& x5 g7 D& c: q
食品加工机器
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奶油夹心饼干
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