The language of everyday life was evolving in Europe and at a certain point in the middle ages it was really only merchants, aristocrats and clergy who could deal with Latin.

在欧洲，日常生活的语言在不断演变。在中世纪的某个时期，真的只有商人、贵族和神职人员才会使用拉丁语。

For an object to be in rotational equilibrium about a certain point, the total torque about this point must be zero.

一个物体若要在某一点处处于转动平衡，在这一点处的总力矩必须为零。

These lines converge at a certain point.

这些线集中于某一点。

At a certain point, it starts to look like that.

到了某一点上看起来就像这样。

At a certain point, you just have to let go.

在特定时刻，你只能放手一搏。