The study group consisted of 52 fraternal and 10 identical twin pairs, plus 3 pairs who were unsure of their twin status. Identical twins share all of their genes and fraternal twins share only about half.

　　這些雙胞胎中包括52對異卵雙胞胎和10對同卵雙胞胎，以及三對不確定自己屬于哪種類型的雙胞胎。同卵雙胞胎的基因完全相同，而異卵雙胞胎只有大約一半的基因相同。

　　From these data, the researchers noted strong ties, outside of twin status, between smoking, older age, and being overweight, and having facial skin with evidence of environmental damage.

　　研究人員通過分析這些數據發現，不論哪種類型的雙胞胎，受到環境傷害的面部皮膚與吸煙、年齡增長、體重超標有很大關系。

　　By contrast, sunscreen use and drinking alcohol appeared correlated with lesser skin damage.

　　相比之下，使用防曬霜以及喝酒的人皮膚損傷較小。

　　Baron and colleagues say the current findings, which highlight ties between facial aging and potentially avoidable environmental factors -- such as smoking, being overweight, and unprotected overexposure to the sun's damaging rays -- may help motivate people to minimize these risky behaviors.

　　巴倫及其同事稱，目前的這項發現強調了皮膚老化和可避免的環境因素之間的關系，如抽煙、體重超標、無防護措施地過度日曬等，該研究可以促使人們盡量避免這些傷害皮膚的風險行為。