passive optical filter

• 被动滤光片

passive optical filter的用法和样例：

例句

1. A satisfactory approximation to monochromatic light can be obtained with a filter placed in front of the arc.
   在碳弧前面放一个滤光片就可以得到令人满意的近单色光。
2. The possibility of designing optical filters using photonic crystals technique was studied in this paper.
   对光子晶体技术在滤光片设计中的应用进行了可行性研究。