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儿童简单机械

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A simple machine for kids makes work easier. This warm guide explains levers, pulleys, ramps, and more with quick demos, safe tips, and short history notes for curious little hands. STEM活动

简单机械：杠杆、滑轮和斜坡的父母指南

简单机械让孩子的工作更轻松。这本温暖的指…

Roshni Sawhny

Roshni Sawhny

3 4 月, 2026 •
1 分钟阅读

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