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如何让回形针漂浮在水面上

如何让回形针漂浮在水面上 — Practical science experiments guides from the Kids lane. HowTo: Family Edition: family how-tos that actually help.

How to make a rocket from a plastic bottle · How to make a wave in a bottle · How to make a balloon powered car · How to make a hovercraft from a balloon and CD · 如何制作一本你自己的定制画册 · 如何整理您的手工用品 · 如何画出你所见的一切