20點~為何羽毛球可以擊出時速三百公里以上? - 運動

By Ida
at 2005-08-31T00:00
at 2005-08-31T00:00
Table of Contents
如題那麼小且輕的奇特球型居然可達到時速三百以上-------------跟它的羽毛設計有關嗎?與其重量有關嗎?謝謝
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By Heather
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