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。

《柯林斯英汉双解大词典》

Here's a good rule of thumb.

下面是一条基于经验的原则。

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A good rule of thumb is to take a whiff of what you are buying.

一个经验之谈就是闻一闻你想购买的东西。

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That's actually a really good rule of thumb.

那实际上是一个好的经验法则。

哈佛公开课 - 计算机科学课程节选

For tax-conscious investors, it's a good rule of thumb to sell losers while holding onto winners.

FORBES: Magazine Article

Statistics vary, but a good rule of thumb is that 90% of startups die within their first three years.

FORBES: Why We Need Startups

It is a good rule of thumb that if the roof sweeps and tapers out like a dainty swallow's tail, the family who built it was wealthy.

BBC: Overcoming 40 years of solitude on Kinmen Island