periodic regulation

例句：

1. 1. The temperature in this area is quite periodic.
   这个地区的温度相当有规律。
2. 2. The production cycle of this product is periodic.
   这种产品的生产周期是周期性的。
3. 3. The moon has a periodic eclipse every few months.
   月亮每隔几个月就会发生一次月食。