longevity 有两个意思,一是表示“长寿”“长命”,相当于 long life;二是表示“寿命”,相当于life span。如:
His longevity was remarkable considering he had been so sick when he was a child. 他自幼多病,能够长寿十分难得。
The worms have a longevity of about two years. 这些虫子大约能活两年。
life span 只表示“寿命”(可长可短)。如:
A fox’s natural lifespan could
be ten years. 狐狸的正常生命期可达10年。