壁球拍
... skis 滑雪板 squash racquet 壁球拍 tennis racquet 网球拍 ...
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It could be something like this a squash racquet.
也可能是其他东西,像壁球拍。
And so we have here a squash racquet and we have here the center of mass.
这里有一只壁球拍,这里是质量重心。