技术老化，是指技术在其生命周期中逐渐不适应社会发展和生产需要而丧失优势的衰退过程。
在即将来临的知识经济时代，技术老化的周期及人们职业变换的进度将越来越快。
With the coming of knowledge economy the ageing period of technology and the speed of the people's occupational change become more quickly than before.
工具老化了，您需要升级它们，从而追赶改进的且曾经演进的技术。
Tools grow old, and you need to upgrade to keep up with improved and ever-evolving technology.
现在，化学家们研发出一种技术，这种技术基于旧书或是历史文档所散发出来的气味，能够鉴别出它们所经历的不同老化过程。
Now chemists have developed a technique that identifies what kind of degradation process an old book or historical document is going through, based on the odors it gives off.
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