孔子云：三十而立，四十而不惑，五十而知天命。

Kong Zi: cloud at forty and perplexed, fifty to know your destiny.

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县里的人不可能仅仅为了一个选举而驾车三四十英里蜿蜒的山路来投票。

There was no way people living out in the country would drive thirty or forty miles over winding roads to vote in just one race.

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新型60瓦LED灯泡售价为四十多美元，而普通灯泡的价格仅为一美元左右。

The newest LED equivalent to a 60-watt bulb costs more than $40, compared with around $1 for a regular bulb.

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In the 1830s 600,000 immigrants came to the United States, almost entirely from Western Europe; in the 1840s alone 1.5 million; and in the 1850s,almost 3 million more.

十九世纪三十年代,约有六十万人移居美国,几乎全部来自西欧,仅在四十年代,就有一百五十万移民,而在五十年代,又多了三百万

耶鲁公开课 - 美国内战与重建课程节选