passive optical 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。 - The possibility of designing optical filters using photonic crystals technique was studied in this paper.
對光子晶體技術在濾光片設計中的應用進行了可行性研究。
