35岁的女性生下的婴儿患唐氏综合症的风险为三百八十分之一，35岁之一，患这种疾病的机率会迅速升高。
A woman’s risk of having a child with Down’s syndrome is 1 in 380 at 35 and rapidly increases after that.
木星的光照程度只有地球的三十分之一，土星为八十分之一，天王星甚至达到三百分之一，而离太阳最远的那些星体，如1845年发现的海王星，光照程度只有地球的九百分之一。
On Saturn, eighty times. On Uranus, even three hundred times; and upon the last of the planets, Neptune, discovered in 1845, light is nine hundred times more feeble than upon our globe.
中国是个大国，百分之八十的人口从事农业，但耕地只占土地面积的十分之一，其余为山脉、森林、湖泊和其他用地。
China is a large country with eighty percent of the population engaged in agriculture, but only one tenth of the land is farmland, the rest being mountains, forests, rivers and places for other USES.
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