U 湿度，潮湿，湿气 degree of moisture, especially in the air; dampness
词汇搭配
形容词+～
the absolute〔relative〕 ～绝对〔相对〕湿度
～+介词
the ～ of …的湿度
句型例句
I don't know relative humidity of today.我不清楚今天的相对湿度。 It's difficult to work because of the humidity.由于空气潮湿，工作很困难。 The humidity of soil helps plants to grow.土壤潮湿有助于植物生长。