He often works by rule of thumb.他通常憑經(jīng)驗(yàn)辦事.As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.憑經(jīng)驗(yàn)估計(jì)，一杯過(guò)濾咖啡約含80毫克咖啡因。A good rule of thumb is that a broker must generate sales of ten times his salary ...

rule of thumb的音標(biāo)：rule of thumb的英式發(fā)音音標(biāo)為：[ru:l ?v θ?m]rule of thumb的美式發(fā)音音標(biāo)為：[rul ?v θ?m]...