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.
即便你去相信，人老后只是他人的累赘，“老化”的阶段也不会变得容易。
Being led to believe that old age is a nothing but a burden to others does not make the "dwindling" period any easier.
这批的存储方式在不同阶段的处理上有意的执行了一个加速老化试验。
The storage behavior of the lots, at different stages of processing, was studied by performing an accelerated aging test.
在过去的几年里，学术界对大脑老化的深入研究确信，在人的中年阶段以及过了这个阶段之后，大脑仍然一直在持续的发育。
Over the past several years, scientists have looked deeper into how brains age and confirmed that they continue to develop through and beyond middle age.
这些初级阶段的立窑装备老化、不完善，工艺落后，消耗大，成本高，生产不稳定，产量质量低，它们正处于被淘汰的处境。
Such as material aging, not perfect, the craft falling behind, consuming greatly, high cost, unsteady production, and low output mass in these entry-level step's sign kilns.
这些初级阶段的立窑装备老化、不完善，工艺落后，消耗大，成本高，生产不稳定，产量质量低，它们正处于被淘汰的处境。
Such as material aging, not perfect, the craft falling behind, consuming greatly, high cost, unsteady production, and low output mass in these entry-level step's sign kilns.
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