constant amplitude sinusoid

例句：

1. 1.The temperature is constant throughout the day.
   温度在整个白天都保持不变。
2. 2. The sun's rays are constant throughout the year.
   太阳的光线全年都保持不变。
3. 3. The weather patterns are constant in this region.
   这个地区的天气模式是恒定的。