Lifetime function
[计] 寿命函数
🧩 词语组成解析
🗣️ 情景例句
What made you decide to study Economics?
你为什么决定修读经济学？
Young man may die but old men must die.
年轻人可能会死，老年人难免不亡。
Fortunately for me, as I was wondering what to do next, there appeared on the horizon a man on horseback, riding in my direction.
不过，我是幸运的，正当我走投无路之时，从天边出现一个骑马的人向我骑来。