He often works by rule of thumb.他通常凭经验办事.As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.凭经验估计，一杯过滤咖啡约含80毫克咖啡因。A good rule of thumb is that a broker must generate sales of ten times his salary ...

As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.凭经验估计，一杯过滤咖啡约含80毫克咖啡因。As a rule of thumb , the minimum device feature is about 4 times the beam diameter.一般来说, 最小器件图形大约是电子束直径的4倍.A rule of thumb ...

rule of thumb的音标：rule of thumb的英式发音音标为：[ru:l ɔv θʌm]rule of thumb的美式发音音标为：[rul ʌv θʌm]...

概测法...

a rule of thumb的音标：a rule of thumb的英式发音音标为：[ə ru:l ɔv θʌm]a rule of thumb的美式发音音标为：[e rul ʌv θʌm]...

n.凭感觉的方法，单凭经验的方法，经验法则，拇指规则...