The twins look the same.

这对双胞胎看上去一样。

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The twins look the same but have very different characters.

这对双胞胎长得很像，但性格很不同。

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Like most twins, the two girls look very much alike, but unlike most twins, Betty and Abby share parts of the same body.

像大多数双胞胎一样，这两个女孩看起来很像，但与大多数双胞胎不同的是，贝蒂和艾比共享同一个身体的某些部位。

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Yes,on average, when you look at this group of 40 or 50 twins reared apart, when you look at the average, they are just about the same.

平均而言，当研究这40或50组被分开抚养的双胞胎，大体看来，他们是一样的。

哈佛公开课 - 幸福课课程节选

You look at identical twins, monozygotic twins who share the same genetic profile.

同卵双胞胎，他们拥有相同的基因谱。

哈佛公开课 - 幸福课课程节选

The same when you look at the average of individuals and twins.

同样，当你平均地看这些双胞胎。

哈佛公开课 - 幸福课课程节选

Differences that explain why identical twins - who share exactly the same DNA and very similar environments - can sometimes look so different, and often develop and die from different diseases.

BBC: 'Not-so-identical' twins may hold the key to disease