Do not use the "shielded" twin lead.

不要使用“屏蔽”双领先。

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Lately, however, twin studies have helped lead scientists to a radical new conclusion: that nature and nurture are not the only elemental forces at work.

然而，近日的双胞胎研究帮助科学家们得出了一个全新的结论：先天和后天因素不是唯一起作用的因素。

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Twin stairs lined with bookcases lead to the bedrooms and become a striking wall of built-in furniture.

与书柜内衬双楼梯导致卧室和成为内置的家具引人注目墙。

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Tommy's says there are a number of risk factors which may lead to premature birth including maternal smoking, infections in the womb, twin or triplet pregnancies.

BBC: Premature births 'are increasing'