词性：adj. 音标： [pərˈpetʃuəl] 释义：无休止的，连续不断的，一直重复的，永久的，永恒的
In casual usage, though, you might hear someone say “This perpetual bad weather needs to clear.” Maybe it should come as no surprise to find people using the word to describe things that are not truly everlasting — since so few things really are.
perpetual motion: 永动机