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SCIENCE STUDY

Solving wobbly wheels

Having a wobbly suitcase is something that most travelers are familiar with. CFP
作者: HANI N. KHAN, SPECIAL TO 21ST CENTURY TEENS
Aa
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科学家揭开行李箱摇晃之谜。

词数 375 建议阅读时间 5分钟 测试见 IV版

You’ve got your fancy new suitcase and you’re ready to take it with you on your travels across the globe.
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