Also, many researchers believe that those who are willing to participate in a study about penis size may have larger than average penises, which would also skew the results.
还有，许多研究者认为那些愿意参与研究小弟弟尺寸的人也许拥有比一般要大的小弟弟，这同样也会影响结果。
Also, many researchers believe that those who are willing to participate in a study about penis size may have larger than average penises, which would also skew the results.
还有，许多研究者认为那些愿意参与研究小弟弟尺寸的人也许拥有比一般要大的小弟弟，这同样也会影响结果。
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