As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.

根据经验法则 一杯过滤咖啡约含80毫克咖啡因

A good rule of thumb is that a broker must generate sales of ten times his salary if his employer is to make a profit.

一个很好的经验法则是，雇主要获取利润的话，其中间人必须创造10倍于自己薪水的销售额。

My TDD rule of thumb is that tests should be moist but not drenched.

我的 TDD 经验法则是，测试应该是湿润的，但是不要湿透。

It's a good rule of thumb, yes.

这是一个号的经验法则，是的。

Here's a good rule of thumb.

下面是一条基于经验的原则。

I had a rule of thumb as a reporter.

我有一个作为记者的法则。