当我访问德国的和硅谷的技术车间时，我被有这么多节目转换产品受困于一个简单却致命的缺陷而震动：机顶盒老化。
As I visited technology workshops in Germany and Silicon Valley, I was struck by how many of these program-shifting products suffer from a simple but fatal flaw: set-top box fatigue.
设计缺陷和液压系统元件的老化是导致龙门铣床出现故障的主要原因。
Design defects and hydraulic system elements aging are the main causes of the gantry milling machine's fault.
雀斑因老化或阳光照射不属于缺陷。
Freckles due to aging or sun exposure are not to be faulted.
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