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空气阻力

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Gravity for kids made clear and cozy. Read a short history, try two safe home tests, and spark wonder tonight. Playful questions and simple safety tips help your child become a tiny expert. 儿童科学

儿童的重力：为什么物体会掉落以及一个睡前测试

为孩子们清晰而温馨地解释重力。阅读简短的…

Jaikaran Sawhny

Jaikaran Sawhny

15 5 月, 2026 •
1 分钟阅读

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