相对湿度恒定的假设是重要的，因为大气中的水蒸气是红外波长辐射的另一种有效吸收剂。
The assumption of constant relative humidity is important, because water vapor in the atmosphere is another efficient absorber of radiation at infrared wavelength.
现在该研究小组使用新的办法提供恒定的湿度，在接下来的几个月内，对不同年代的各类陶瓷进行新的测试。
Now the research team is using new methods to provide constant humidity and will run additional tests over the next few months on various types of ceramics of different ages.
将影响空气折射率的大气密封在一个温度、压力、湿度恒定的柱体中。
The atmosphere which can affect the refractive index of air is sealed in a column where the temperature, pressure and humidity maintain constant.
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