那里你可能看到兄弟，或者姐妹，或者异父母同胞，或者双胞胎兄妹。
There, you may see a brother, a sister, a step-sibling, a twin.
如果你打算怀双胞胎或者三胞胎你要增加更多的重量。
If you're carrying twins or triplets, you might need to gain more weight.
但是，没有一个父母被告知他们的孩子是双胞胎或三胞胎中的一个，或者被告知这项研究是有关先天和后天对人的影响。
No one, however, was told that the child was a twin or triplet, or that the study involved the influence of nature versus nurture.
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