This makes it tough to follow the first rule of having a newborn: sleep when the baby sleeps.

这使得你难以按照育儿的第一条规则去做：孩子睡，我们睡。

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Mileage differ between car makes and models, although a good rule of thumb is that you should get more miles per gallon if your car has a smaller engine.

汽车品牌和型号不同，行车里程也不同，虽然根据经验车的引擎越小每加仑油可行使的里程就越长。

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As a branding rule of thumb, two unconnected nouns, such as “skin” and “fruit”, are entirely unmemorable unless they combine into something that makes sense, like “fruit salad”.

按照命名的不二法则，两个毫不相干的名词，如“皮肤”和“水果”组合在一起，不会给人留下任何印象。 只有组合成像“水果沙拉”这样有意义的词，人们才有反应。

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The exit of one small country from the euro opens a fissure in the eurozone structure that makes contagion the only rule of the day.

CNN: Does Spain deserve its financial battering?

The very, very early review makes clear that cost-cutting is the rule of the day: a 2010-era Snapdragon chip, 512MB of RAM and a fairly low-grade 4-inch LCD don't afford much in the way of bragging rights.

ENGADGET: Sony Xperia J gets a pre-unveiling hands-on, suggests we'll get exactly what we pay for

We will, however, see a lessening of the rigidity of the rule of thumb that zero inventory makes the best business sense.

FORBES: Supply Chain Lessons From Japan