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(duì)事物）粗略但實(shí)用的估計(jì)方法（通常憑經(jīng)驗(yàn)而不作精確的計(jì)量等，故并非時(shí)時(shí)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(jīng)驗(yàn)估計(jì)，每磅雞肉應(yīng)烹調(diào)20分鐘。
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