the part of a person's life that they spend working 职业生涯◆He spent his whole working life in publishing. 他一生都从事出版业。
the total amount of time that a machine, a factory, etc., operates (机器、工厂等的)工作年限,使用寿命◆These parts will need to be replaced several times during the machine's working life. 这些零部件在机器的工作年限内需要更换几次。