Operational life span
[计] 使用寿命
🧩 词语组成解析
life
[laɪf]
n. 生活，生计;生命，性命;一生，寿命;人生，尘世;
span
[spæn]
n. 共轭（马、骡）;跨度，墩距;一段时间;[航] 跨绳;
vt. 缚住或扎牢;跨越时间或空间;以掌测量;以手围绕测量类似测量;
🗣️ 情景例句
I hope I'll go down in history as a famous English professor.
我希望成为未来历史上有名的英文教授。
An ox is taken by the horns, and the man by the tongue.
牛因有脚而被抓，人因有舌而遭殃。
How would you go to Beijing, by air or by train?
你怎样去北京，是乘飞机还是坐火车？