它们大部分都使用了二、三十年，逐渐进入老化阶段。
Majority of them have used for twenty or thirty years, and they are entering the aging step gradually.
笔者以充油电缆绝缘结构为研究对象，采用红外光谱分析技术对不同热老化阶段的电缆油油样进行了理化分析。
In this paper, the high voltage oil-filled cable insulating structure is investigated, and the infrared spectral analysis is used to analyze the cable oil samples in different thermal aging stages.
随着我国部分房屋建筑使用年限接近设计期限，或者说结构进入老化阶段，结构的健康状况和安全性评估逐步引起人们的关注。
As service life of buildings approaching to projected life, or their structures entering aging stage, people are gradually concerned about the health status of the structure and security estimation.
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