湿度

例句：

1. 1. The room is too dry; we need to increase the humidity.
   房间太干燥了，我们需要增加湿度。
2. 2. The farmer used to measure the soil's moisture content.
   农民过去测量土壤的水分含量。
3. 3. The air quality index (AQI) measures the level of pollution in the atmosphere, which can affect humidity levels.
   空气质量指数衡量大气中的污染程度，这会影响湿度水平。