单词：etalon
etalon的用法和样例：
例句
- So, in effect, the etalon as a whole functions as a mirror that reflects only one specific color, which you can choose simply by changing the spacing between the surfaces.因此，标准具的整体功能相当于只会反射一种颜色的镜子，只要改变两个表面的间距，就能选择反射光的颜色。
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