A rule of thumb is a general estimate.

一则经验法则是一种大致的估计。

A rule of thumb is a practical but approximate way of doing something.

经验法则是一种实用且相似的做事方法。

There is a rule of thumb here, which I believe very useful.

这里有一条经验法则，我认为它非常有用。

A rule of thumb is a useful but approximate way of doing or measuring something.

经验法则是一种实用且相似的做事方法或衡量方法。

But a good a rule of thumb is to look for ingredients you don't recognise.

但一条好的经验法则是寻找你不认识的成分。

As a rule of thumb, the further away from the singularity you are, the longer you live.

根据经验，离奇点越远，存活时间越长。

Well, because while calories can be a rule of thumb, they tell you pretty much nothing about hormones.

因为，这一法则尽管完全正确，却没有考虑或涉及到荷尔蒙的作用。

Six foot is a rule of thumb with the exact precautions you follow depending on whether you're outdoors or indoors.

保持六英尺的距离是经验法则，但根据你在室外或室内，应遵循确切的预防措施。

There's been a rule of thumb historically.

历史上有一个经验法则。

There’s a rule of thumb for where to aim.

瞄准哪里有一个经验法则。