Non-identical twins are the result of two fertilized eggs implanting in the uterus at the same time.

非同卵双生胎是两个受精卵同时在子宫着床的结果。

《柯林斯英汉双解大词典》

They study pairs of identical twins who grew up in different surroundings, like Jim Springer and Jim Louis.

他们研究了像吉姆·施普林格和吉姆·路易斯一样在不同环境中长大的同卵双胞胎。

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For example, Jim Springer and Jim Louis are identical twins.

例如，吉姆·施普林格和吉姆·路易斯是同卵双胞胎。

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It even distinguished between identical twins--their genes are the same, but their irises aren't.

FORBES: Spotting Evil

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

The twin rule of pathology states that any heritable disease will be more concordant (that is, more likely to be jointly present or absent) in identical twins than in non-identical twins and, in turn, will be more concordant in non-identical twins than in non-siblings.

ECONOMIST: Twin studies, genetics and the environment