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

Here's a good rule of thumb: If your total student loan debt exceeds the amount you expect to earn in your first year out of school, you're borrowing too much.

NPR: Exercising Caution on College Loans

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