alternation
noun /ˌɔːltəˈneɪʃn/
  /ˌɔːltərˈneɪʃn/
- [uncountable] the fact of two things following one after the other in a repeated pattern 交替;轮流 - the alternation of day and night日夜交替 
 
- the alternation of day and night
- [countable, uncountable] the act of changing from one thing to another and back again交替 - Such rapid alternations of mood are a feature of her writing.如此快速的情绪变化是她文字作品的一个特征。 
 
- Such rapid alternations of mood are a feature of her writing.