The rule of thumb in this business is courtesy.

这门生意的形式法则是礼貌至上.

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The rule of thumb is liable to be cut away from the constantly - changing reality.

这种单凭经验来做的方法很有可能与不断变化的现实脱节.

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But the rule of thumb is sheep are carriers, pigs are amplifiers, and cows are indicators.

但是靠经验粗略估计,绵羊是带毒者 、 猪病毒扩增者, 牛是病毒指示动物.

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