ground colour light signal

例句：

1. 1.The ground colour of the flower is a deep purple.
   这朵花的地面颜色是深紫色。
2. 2. The light signal from the satellite was clear and strong.
   卫星发出的光线信号清晰而强烈。
3. 3. The ground colour of the soil varies depending on the type of plant.
   土壤的地面颜色取决于植物的类型。