其关键部件在接近使用寿命极限时，产品质量极不稳定。
When its key parts close to their life time, products quality is very unstable.
长寿人数不断增多，说明寿命极限还未到，人的平均寿命仍有可能提高。
Continued progress in the longest-living populations suggests that we are not close to a limit, and further rise in life expectancy seems likely.
同时，它高效的性能使之即便在接近寿命极限时，仍能保持百分之七十的亮度。
At the same time, its efficient performance can even close to life time, still can maintain seventy percent brightness.
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