各种外在因素往往结合在一起，在我们自然老化的过程中使得我们皮肤的老化程度高于自然老化。
A number of extrinsic, or external, factors often act together with the normal aging process to prematurely age our skin.
外在因素引起的老化是可以预防和改善的。
本文述评了国外在绝缘老化测试和统计方面已取得的成果；
This paper presents the main achievements made abroad in the field of the diagnostic and statistic of insulation…
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