1、Earthquakes are nonperiodic events that can occur at any time.
地震是不定期发生的事件，可以在任何时候发生。

2、The stock market is known for its nonperiodic fluctuations.
股市以其不规律的波动而闻名。

3、The irregular and nonperiodic sleep patterns can disrupt one's circadian rhythm.
不规律和非周期的睡眠模式会干扰人的昼夜节律。