The bigger the difference in perceived age within any twin pair, the more likely it was that the older-looking twin died first.

任何一对双胞胎中，如果表象年龄差别越大，则显老的那个人越可能先死。

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He and his wife now have a pair of five-year-old twin sons.

他和妻子现在有一对5岁的双胞胎儿子。

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In order not to be mistaken for his twin brother, Kevin wore a pair of glasses at the party.

为了不被误认为是他的孪生兄弟，凯文在聚会上戴了一副眼镜。

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Scott Brown is emphasizing women in a twin pair of advertisements narrated by his wife Gail Huff.

FORBES: Scott Brown Ads Focus on Being a Great Family Guy

Each twin of a pair played the ultimatum game, both as proposer and as responder.

ECONOMIST: Evolution

In New York, where al Qaeda used a pair of hijacked commercial jetliners to take down the twin towers of the World Trade Center on September 11, 2001, the Port Authority of New York and New Jersey said it was increasing police presence at all its facilities, including the site where the World Trade Center once stood, according to Chris Ward, executive director.

CNN: U.S. anticipates al Qaeda 'threats of retaliation'