etalon

英 ['etələn] 美 ['etəˌloʊn]

• n. [物]标准具(其上有两面可调节的平行反射镜)

例句

用作名词 (n.)

1. 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。