Rough practical method of assessing or measuring sth, used based on past experience rather than on exact measurement, etc (and therefore not completely reliable in every case or in every detail)（對事物）粗略但實用的估計方法（通常憑經驗而不作精確的計量等，故并非時時處處均可靠）。
例如：As a rule of thumb, you should cook a chicken for 20 minutes for each pound that it weighs.
憑經驗估計，每磅雞肉應烹調20分鐘。
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