per·en·ni·al
adjective/pəˈreniəl/
/pəˈreniəl/
- continuing for a very long time; happening again and again
长久的；持续的；反复出现的 - the perennial problem of water shortage
缺水这个老问题 - that perennial favourite, hamburgers
汉堡包，永远受人喜爱的食品 - Colonialism in different forms is a perennial theme of history.
不同形式的殖民主义是历史永恒的主题。
- the perennial problem of water shortage
- (of plants) living for two years or more
多年生的
Word Originmid 17th cent. (in the sense ‘remaining leafy throughout the year, evergreen’): from Latin perennis ‘lasting the year through’ + -ial.