/pɚˈpetʃ.u.əl/
A perpetual feeling, state, or quality is one that never ends or changes.
continuing for ever in the same way:
They lived in perpetual fear of being discovered.
He has hard, cold eyes and his mouth is set in a perpetual sneer.
a perpetual student
the perpetual noise of traffic
持续不断的交通噪声
We lived for years in a perpetual state of fear.
多年来我们一直生活在恐惧中。