单词：air layer
air layer的用法和样例：
例句
- The layer of air near the earth is cooler than an overlying layer.靠近地表的空气层比其上面的层气温低。
- If the thickness of one air layer is changed, a defect comes into being, and the corresponding defect mode in the PBG will change accordingly.如果改变某空气层的厚度，会在光带隙中产生缺陷态，缺陷态的位置随该空气层的厚度的改变而改变。
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