periodic intensity

例句：

1. 1. The temperature in this area is periodic with extremes of 40°C and -20°C.
   这个地区的温度是周期性的，极端温度可以达到40°C和-20°C。
2. 2. The moon has a periodic cycle that affects the tides.
   月亮有一个周期性的周期，影响潮汐。
3. 3. The earth's orbit around the sun is periodic, resulting in seasons.
   地球围绕太阳的轨道是周期性的，导致四季更替。