作为一个经验法则，我每两杯米加一杯水。

As ___a ___rule ___of ___thumb, I add one cup of water for every two cups of rice.

一个有用的经验法则是，演讲时每两分钟准备一张幻灯片。

A useful ___rule ___of ___thumb for presentations is to have one slide for every two minutes of speaking time.

我们办公室的一个经验法则是，任何软件项目的初始时间预估都要翻倍。

___A ___rule ___of ___thumb in our office is to double the initial time estimate for any software project.