wavelength plate

例句：

1. 1. The wavelength plate is used to measure the wavelength of light.
   波长片用于测量光的波长。
2. 2. The scientist used a wavelength plate to analyze the spectrum of the light.
   科学家使用波长片来分析光的光谱。
3. 3.The wavelength plate was crucial in the development of the new optical instrument.
   波长片在新型光学仪器的开发中起到了关键作用。