periodic spontaneous pressure

例句：

1. 1. The temperature in this region varies periodically with the seasons.
   这个地区的温度随季节变化而周期性地变化。
2. 2. The research is based on a periodic pattern of data collection.
   这项研究基于数据收集的周期性模式。
3. 3. The moon has a periodic cycle that repeats every 29.5 days.
   月亮有一个周期性周期，每29.5天重复一次。