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.

　　这些双胞胎中包括52对异卵双胞胎和10对同卵双胞胎，以及三对不确定自己属于哪种类型的双胞胎。同卵双胞胎的基因完全相同，而异卵双胞胎只有大约一半的基因相同。

　　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.

　　研究人员通过分析这些数据发现，不论哪种类型的双胞胎，受到环境伤害的面部皮肤与吸烟、年龄增长、体重超标有很大关系。

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

　　相比之下，使用防晒霜以及喝酒的人皮肤损伤较小。

　　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.

　　巴伦及其同事称，目前的这项发现强调了皮肤老化和可避免的环境因素之间的关系，如抽烟、体重超标、无防护措施地过度日晒等，该研究可以促使人们尽量避免这些伤害皮肤的风险行为。