2001年，丹麦研究者对1800多对年过70的双胞胎进行了身体和认知测试，还拍了他们的脸部照片。
In 2001, Danish researchers conducted physical and cognitive tests on more than 1,800 pairs of twins over aged 70, as well as taking photos of their faces.
还存在着第三种双胞胎，但是是很少见的一种。
There is a third type of twins, but it is a very unusual one.
他们的其他孩子还包括两对双胞胎。 而且，每个孩子的名字都是以字母“J”开头的，最大的17岁，最小的才刚刚降生。
Their children include two sets of twins, and each child has a name beginning with the letter "J".
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