step filter的用法和樣例：
例句
- A satisfactory approximation to monochromatic light can be obtained with a filter placed in front of the arc.
在碳弧前面放一個濾光片就可以得到令人滿意的近單色光。 - This article firstly advances the designing of a wide wave band polarization rotator by using Polarization Interference Filter.
首次提出了基於偏振干涉濾光片設計方法的寬波帶偏振方向旋轉器。
