It could be something like this a squash racquet.

也可能是其他东西，像壁球拍。

youdao

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。

youdao

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。

youdao