dew-point. spread

例句：

1. 1. The dew-point temperature is 15 degrees Celsius.
   露点温度是15摄氏度。
2. 2. The weather forecast predicts a low dew-point temperature for tomorrow.
   天气预报预测明天的露点温度较低。
3. 3. The plant needs to be kept at a constant dew-point temperature to prevent damage.
   为了保护植物，需要保持恒定的露点温度。