但是当这对夫妻发现他们即将有一对双胞胎时，毅力抵消了一切困难。“那是非常棒的感觉，毕竟是我们的成就，”席琳说。
But the perseverance paid off when the couple found out they are expecting twins. "There were truly great emotions after all our efforts," says the singer.
尽管我知道她身体里的孩子是我的，但和我怀双胞胎女儿的时候感觉完全不一样。
Although I knew that child inside her was mine, it wasn't the same feeling I had with the twins.
研究者检测一种特性，例如感觉的寻求，在相同的环境下，相同的双胞胎兄弟成长，考虑是否两个双胞胎类型是完全相似。
Researchers measure a trait, such as sensation-seeking, in identical and fraternal twin pairs growing up in the same environment, and consider whether the two twin types are equally similar.
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