如果生产流程中使用的一台机器的寿命有很多年，那么它的价值将随着时间消耗，并需要在使用年限到期时更换。
A machine with a productive life of many years that is used in the production process wears out over time and at the end of its lifetime needs to be replaced.
灯泡制作者使用热量来模拟使用年限。
因为有些研究包括了那些不频繁使用手机的人的数据，或者那些使用手机年限不够长的人的数据，哈德尔猜测他们罹患癌症的风险太低。
Because some studies included data on people who used cell phones infrequently, or who had not used them for many years, Hardell suspected that their cancer risk findings were too low.
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