The difference in parental attitudes between first-borns and subsequent children is large and significant.

第一次怀胎与其后相比，父母的态度变化巨大而且意义非同小可。

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It's the difference between first watching an experienced mechanic, and then haphazardly trying to wing rebuilding an engine.

这就是与第一次看完一位熟练的技工操作，然后自己胡乱去重组一台机械不同之处。

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It's the first-ever meeting between leaders of the two countries.

这是有史以来两国领导人的第一次会晤。

《柯林斯英汉双解大词典》

Professor Robinson says it is not clear when the first marriage between a black person and a white person took place.

VOA: special.2010.09.03

So, let's think about kind of differentiating, however, between first ionization energy or just ionization energy, and other types such as second or third ionization energy, and let's take boron as an example here.

那么，让我们来区分一下第一电离能，也就是电离能与其他类型的电离能，比如第二，第三电离能，我们以硼为例。

麻省理工公开课 - 化学原理课程节选

Just as I foreshadowed, if you look at the difference between the first and third quartile in the bond market -these are active returns over a ten-year period again ending June 30,2005 -and the fixed income market, the difference between first and third quartile is a half a percent per annum.

如我之前所示,如果观察,债券市场中的第一和第三个四分位数,四分位数即统计学中,把所有数值由小到大排列并分成四等份三个分割点位置分别就是三个四分位数 考虑十年期的主动型的收益,截止于2005年6月30日,在债券这个固定收益市场,第一和第三个四分位数,每年只差0.5%

耶鲁公开课 - 金融市场课程节选

Novelists must choose between first-person and third-person point of view (unless they're Jay McInerney).

WSJ: Nancy Bilyeau: What Novelists Can Learn From Screenwriting | Word Craft

The average lapse between first and second births in South Africa is almost four years.

ECONOMIST: Africa��s population

It follows talks between First Minister Carwyn Jones, Plaid Cymru and the Liberal Democrats.

BBC: Pound coins