dew-point indicator

例句：

1. 1. The temperature at the dew point is critical for determining whether a crop will grow well.
   露点温度对于判断作物能否良好生长至关重要。
2. 2. In meteorology, the dew point is used to calculate the relative humidity of the air.
   在气象学中，露点被用来计算空气的相对湿度。
3. 3. The farmer carefully monitored the dew point to ensure his crops were getting enough water.
   这位农民仔细监测了露点以确保他的庄稼得到了足够的水分。