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.
使用久后电缆线会发生硬化等不安全事故，机器所需的电流增加或电缆线到一定年限必须更换电缆线。
After using a long cable sclerosis unsafe incidents occur, the current required to increase the machine or cable to a certain number of years the cable must be replaced.
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