For a long time, this was sufficient justification for Friedmann's assumption—as a rough approximation to the real universe.

很长一段时间，这足以证明弗里德曼的假设——作为对真实宇宙的粗略近似。

So, university professors have teaching evaluations and you could use this as a rough and ready approximation of what students think of them.

因此，大学教授会进行教学评估，您可以将其用作学生对他们的看法的粗略且现成的近似值。

A rough approximation to the average duration of these mountain lakes may be made from data already suggested, but I cannot stop here to present the subject in detail.

可以根据已经提出的数据粗略估计这些高山湖泊的平均持续时间，但我不能就此停下来详细介绍这个主题。