a rule of thumb什么意思？

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 ...

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]...

mesocaryote的音标：mesocaryote的英式发音音标为：[mesəʊkæri':əʊti:]mesocaryote的美式发音音标为：[mesoʊkæri'oʊti]...

v.讨好，谄媚( ingratiate的过去式和过去分词 )...

adj.笨拙的，（树）劈成木材的...

adj.（指眼镜片）双焦的，双光的，有二重观点的n.双重焦点透镜，双光眼镜...

bun的复数形式为：buns...

史密斯先生在钻石上雕刻小平面的精湛技巧真是了不起.The skill with which Mr. Smith faceted the diamond is remarkable.这条路在经过平面交叉道口后岔开了.The road branches after the level crossing.经过充分切刻的光彩夺目的钻石有68个小平面.A fully cut brilliant diamond has 68 facets....

adv.体格上，身体上，物理上，完全地...

n.清洁剂，清洁工，擦亮粉，去污粉，清洁器...

“柔软”的反义词：僵硬, 刚硬, 坚硬。...

below的音标：below的英式发音音标为：[bɪ'ləʊ]below的美式发音音标为：[bɪ'loʊ]...

embrittling的音标：...

bassoon的音标：bassoon的英式发音音标为：[bə'su:n]bassoon的美式发音音标为：[bə'sun, bæ-]...

tawdry的最高级为：tawdriest...

欲知马咋样,可看套马索.You may knowinging the horse harness.欲知马如何,可看套马索.You may know horse harness....

Aeolic的音标：...