horizontal line frequency

例句：

1. 1.The horizontal line frequency is a measure of how often the sun appears in the sky.
   水平线频率是太阳在天空中出现频率的度量。
2. 2.The horizontal line frequency affects the amount of sunlight that reaches the earth's surface.
   水平线频率影响到达地球表面阳光的数量。
3. 3.The measurement of horizontal line frequency can be used to predict weather patterns.
   测量水平线频率可以用于预测天气模式。