它产生粘稠的黏液并在黏液上爬行消耗了大量的能量，而一只老鼠移动同样的距离只消耗了十二分之一的能量。
It uses so much energy producing the slimy mucus and crawling over it that a mouse traveling the same distance uses only one twelfth as much energy.
研究表明，十二分之一的女性易患乳腺癌。
The study showed that one in twelve women is likely to develop breast cancer.
制犁劳动的十二分之一还是-可觉察的数量。
A twelfth part of the Labour of making a plough is an appreciable quantity.
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