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发表于2024-12-29
Gizmos and Gadgets pdf epub mobi txt 电子书 下载 2024
Kids will have a blast investigating the hows and why of motion, friction, gravity, energy, balance, and spinning by constructing awesome working contraptions. Find out how parachutes, catapults, hovercraft, and whirligigs work -- and more
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Gizmos and Gadgets pdf epub mobi txt 电子书 下载 2024