A thick needle topped with a wedge of cork (or a mini hand-drill).

一根粗粗的有楔形软木塞顶在上面的针，或者一个微型手钻。

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Drill out the center of a bat and replace it with cork, you get a lighter, faster swing.

把球棒的中心挖空，用软木塞来代替，如此一来球棒会变轻，挥棒速度会变快。

youdao

Drill out the center of a bat and replace it with cork, you get a lighter, faster swing.

把球棒的中心挖空，用软木塞来代替，如此一来球棒会变轻，挥棒速度会变快。

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