low index短语¹⁴⁴⁹⁷²⁺² 基本例句 低指数 For certain bandwidth, increasing difference between high and low/span> index and selecting out- layer material with low index are very important for achieving an excellent anti- reflectance performance. 对特定的带宽，增加两种薄膜材料的折射率差和选择尽可能低的最外层折射率对获得优良的减反射特性是非常重要的。 opticsjournal