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楔子

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A friendly guide to the simple machine for kids. Clear definitions, everyday examples, three ten-minute builds, safety notes, a short history, and Storypie links. Perfect for parents and teachers wanting hands-on learning.

儿童简单机械：动手构建与示例

儿童简单机械的友好指南。清晰的定义、日常…

Roshni Sawhny

4 5 月, 2026 •