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1·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》

2·Velia: no, they're non-identical twins. A girl and a boy. The boy was born first.

维莉娅﹕不是，是不相同的孪生婴儿，一女一男，男的较先出世。

3·Before then, both identical and non-identical twins have largely independent odds of reaching a given age.

那之前，无论同卵还是异卵双胞胎在达到某一既定年龄时都在极大程度上有各自不同的几率。

4·Through a study of nearly 1000 pairs of identical and non-identical twins, British and Australian researchers found genes control half the personality traits that make people happy.

英国和澳大利亚科学家通过对将近1000对双胞胎的研究发现，人类的快乐情绪一半是由基因控制的。

5·Studies comparing identical with non-identical twins have helped to establish the heritability of many aspects of behaviour, and examination of DNA has uncovered some of the genes responsible.

关于同卵和异卵双胞胎的研究成为了行为在很多方面受遗传影响的有力证据，对DNA的检测揭示了一些基因的作用。