squash racquet

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。

So the behavior of the center of mass is extremely predictable , whereas the behavior of the squash racquet is not .

那么整体中心的运动，就是可预测的，而壁球板运动不可知。

If the external force on the squash racquet were zero , then it would continue to go always with the same velocity , the center of mass .

若壁球板受外力为，它可能会一直运动，保持同样的速度，而整体的中心。

So the next time I see a squash racquet , I will silently salute girls such as Malala and Maria Toorpakai - and be profoundly grateful for the freedom that women take for granted in the west .

所以下次我再看到壁球拍，我会默默向马拉拉和玛利亚•图帕凯这样的女孩们致敬——并由衷感激自己享有的自由，虽然它已被西方女性视作理所当然。