英音 
[ˌɔ:ltə'neɪʃn]
 
美音 
[ˌɔltɚˈneʃən, ˌæl-]
 
alternation 基本解释
n.交替，轮流，间隔；交替工作；更迭；变换

例句：
Here we see the alternation which is involved in the notion of a condition . The conditions of a thing seem at first sight to involve no bias any way .
从这里我们便可看出，条件一概念所包含的交替性了，一物的条件最初看来好象完全是单纯无偏似的。

Power alternation also polarises debate .
权力的更迭也加剧了辩论的两极分化。

The alternation of light and shadow let lips spallation .
光与影的交替，令樱唇蜕变。

The rapid alternation of two tones either a whole or a half tone apart .
颤音两个相距一个音或半个音的音的迅速交替。