an instrument that uses the difference in readings between two thermometers,one having a wet bulb and the other having a dry bulb,to measure the moisture content or relative humidity of air是什么意思_an instrument that uses the difference in readings between two thermometers,one having a wet bulb and the other having a dry bulb,to measure the moisture content or relative humidity of air在线翻译_英语_读音_用法_例句