the part of a person's life when they do a job or are at work

His entire working life was spent with the same firm. 他一生都在为同一家公司工作。

the complete amount of time for which a machine can be expected to operate

The working life of most vehicles can be increased if they are serviced regularly. 如果定期保养，大部分车辆的工作寿命都能延长。