Definition: the amount of time that a machine, system, etc., exists or can be used Level: C2
新型电池的使用寿命更长。
The newer batteries have a much longer ___life.
小心使用可以延长你机器的使用寿命。
Careful use will prolong the ___life of your machine.
在当前系统的使用寿命期间，软件更新将不可用。
The software update will not be available during the ___life of the current system.
