Interactive effects, either between multiple genes or between genes and environment, will not be detected in a twin study.

相互影响的效果，或者在多种基因之间或是在基因与环境之间，并不能在双生子研究中检测到。

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The drug is not intended for use in women with a multiple pregnancy, such as a twin pregnancy, or other risk factors for preterm birth.

这种药物不是为多胎妊娠（如双胞胎妊娠）或有其他早产风险因素的妇女设计的。

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While the Super Bowl can draw 100, 000 people or more, the political convention is a multiple-day event during which the convention -- and the Twin Cities -- will be watched by a broader audience around the world, Mr. Canton said.

WSJ: With Republican Convention, It's a Green State