perpetual
/pəˈpetʃuəl; pɚ`pɛtʃʊəl/ adj[usu attrib 通常作定语]
1 continuing indefinitely; permanent 永久的; 永恒的
the perpetual snow of the Arctic 北极终年不化的积雪.
2 without interruption; continuous 不间断的; 持续的
the perpetual noise of traffic 不绝於耳的交通噪音.
3 (infml 口) frequently repeated; continual 反覆的; 不断的
He was irritated by their perpetual complaints. 他们一再发牢骚把他惹火了.